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Lenovo Legion Y27Q-20 review

While LG’s 27GL850-B is still hard to get, it’s display panel is available for other brands to use in their design. Currently the Lenovo Legion Y27Q-20 and Viewsonic’s XG270QG are available for purchase. Let’s look at their key features.

27GL850-BY27Q-20XG270QG
Adaptive SyncFreesync/G-Sync compatible Freesync/G-Sync compatible G-Sync
Refresh144Hz165Hz165Hz
USB ports2 (back)3 (2 side, 1 bottom)3 (bottom)
StandHeight, tilt, pivot
Metal and plastic
Height, tilt, pivot, swivel
Fully metal
Height, tilt, pivot, swivel
Other Audio out
VESA100
Audio out/mic in
VESA100
Headphone hook
Low blue light mode
Audio out
VESA100
Headphone hook,
Low blue light mode
Mouse cable hook
RGB features
Hood
MSRP$499.99$549.99$675.99

It will be interesting to see if the G-Sync module in Viewsonic’s offering will make a difference to overdrive behaviour at lower framerates. Note that there is also a Y27GQ-20 ($629.99 MSRP) available which has a G-Sync module if that’s your requirement. This display does only come with an 8bit TN panel though.

Unboxing and features

Unboxing the monitor is a nice experience, the monitor is packed in styrofoam and has a box with a handle and a lid that’s able to close again which makes transporting the monitor easier. In the box you’ll find:

  • Displayport 1.4 cable
  • HDMI 2.0 cable
  • USB 3.1 type B upstream cable
  • Power brick
  • Power lead
  • Documentation

The base of the stand and it’s upright will have to be assembled with an integrated screw, after this it’s possible to attach the panel to it’s base with some locking hooks. No tools are required. The base feels very heavy and strong, it’s all metal. The bottom plate is a thick piece of metal with holes in it and a blue underside which looks quite pleasing and unique.

The display itself is technically the same as in LG’s 27GL850. It features a 1440p resolution, 165Hz refresh rate at 10bits and internally processes this at 8bit+frc. It’s contrast ratio is stated at 1000:1 but given the performance of LG’s offering it’s expected to be around 850:1.

Mounting the display to a VESA100 arm went well but the cables attach to the monitor quite low at the back of the display. The connections are oriented vertically so when mounted to an arm, you will notice the USB upstream and DisplayPort cables exiting from the bottom. Getting some right-angle adapter should fix this if you’re after a clean setup.

First impressions and build quality

Turning on the monitor for the first time greets you with a Lenovo logo and a vibrant image due to it’s wide color gamut support. The interface is controlled by using the front buttons, there are six in total of which one is reserved for a power toggle. They feel nice and clicky. When the menu is closed, the five buttons will act as shortcuts to the following settings.

  • Game settings (profiles, overdrive and on screen framerate)
  • Input toggle
  • On screen refresh rate options
  • Birghtness and color settings
  • Main osd menu

All pages can be accessed from all shortcuts by backing out of the current page. It would’ve been nice if the buttons could’ve been assigned custom functions. I personally do not enjoy the menu system all that much but after setting up the monitor you’re not likely to use it all that much. I only wish there would’ve been a way to quickly toggle sRGB mode. I do enjoy that the menu gives you an option to set a timeout so that it stays open for longer when adjusting settings.

There is one usb port on the underside and two on the left side of the monitor. There is also a 3.5mm audio jack on the left which can be used as a headphone TRS output as well as a TRRS headset connection providing a 24 bits at 48KHz microphone input. This input also seems to provide some form of echo cancelation. The input provides some decent quality.

Issues

An issue with the OSD I noticed is that it won’t show if your refresh rate is set to anything below 100Hz. I also prefer to have most of the USB ports on the back of the display. Having two on the back gives the option to plug in a keyboard and mouse which leaves one on the left free for charging a phone. Lenovo has chosen to have two on the left side and one on the back, not a huge deal at all but noteworthy.

Another minor issue is that the monitor, on NVIDIA at least, defaults to 8bits per channel even though it can do 10bits at 165Hz. Going into the NVIDIA control panel and setting the color settings to manual allows you to enable 10bpc. You’ll be hard pressed to see the difference though unless you like staring at gradients.

Picture quality

Out of the box

The monitor comes preset with Game mode set to Off, these modes are different profiles and all have their own character. Besides Off there are: FPS1/2, Racing, RTS and Game 1/2. All modes basically lock out every other setting in the monitor so leaving Game mode to Off will give most flexibility. The monitor offers controls for Brightness, DCR(dynamic contrast), Saturation, Contrast, Color Temp. and Dark Boost. It does however lack a mode to change gamma, so unless Lenovo decides to add this to a future firmware update you’ll be stuck with the default gamma. Let’s hope it’s set right then!

sRGB mode

Let’s first take a look at sRGB mode which should be factory calibrated, this mode locks out all settings except brightness.

Whitepoint6423K
Contrast863:1
Average dE0.88
Maximum dE1.54

These results are pretty great, the monitor has no problems display sRGB content in this mode. The only slight problems here are a slight green tint in greyscales and slightly elevated gamma values near pure white. This means that highlights might get clipped slightly as seen in the last picture above which was taken with a camera.
It’s below average contrast ratio for an IPS display is expected with this panel and even though it’s a bummer, it’s very difficult to see the difference between this panel and an IPS panel that has a 1000:1 contrast ratio or higher.

Unclamped gamut

Comparing the uncalibrated display against DCI P3 and sRGB yields worse results. Setting the whitepoint required me to set the Color Temp. to RGB 100/97/100 since the default values gave a green hue, setting the display to it’s Normal white point setting also resulted in a better whitepoint.

Color performance compared to DCI P3 is actually pretty good but gamma performance falls short here.

Comparing the uncalibrated display to sRGB also shows a pretty poor result but this is to be expected when comparing an unclamped gamut to sRGB. The gamma respons is still pretty poor though. Let’s see how calibration can improve results then.

Post calibration

The monitor has been calibrated with an X-Rite i1Display Pro colorimeter using DisplayCAL software. DisplayCAL is using the “LG 27GL850 by 4KM for newDP (i1 Pro)” correction with an sRGB gamma target. Note that this is only the gamma response (luminance) and not clamping the color gamut.

Calibrating the display is pretty straightforward since there is not a lot you can and should adjust. sRGB mode is set to off, contrast is set to 85 and reducing brightness to around 20 will give around a 120cd/m2 brightness level. Measuring and profiling then gave the following results.

Contrast840:1
sRGB gamut99.8%
Adobe RGB gamut 85.9%
DCI P3 gamut 94.8%
Min brightness 62cd/m2
Max brightness 380cd/m2

The green tint in the greyscale response has been corrected. Comparing the color gamut to sRGB shows that it’s easily capable of covering the entire gamut. Looking at DCI P3 shows that it can cover most of it’s gamut but that it lacks some saturation towards green and cyan. Adobe RGB is also covered pretty well here with slight under saturation in the reds and greens which results in slightly under-saturated yellows.

Compared against other color spaces

Measuring this profile against several color spaces gives the folowing results. Note that Adobe RGB has several high dE spikes since the monitor is technically not able to display the full saturation targets of Adobe RGB.

sRGB DCI P3 D65 2.2 Adobe RGB
Average dE0.340.591.16
Maximum dE1.121.45.35

Below are parts of the measurement report for sRGB, DCI-P3 and Adobe RGB verifications showing more detail.

These results are excellent and anyone who has access to a calibration device should have a great experience with this monitor while doing color-critical work.

Color profiles

Several people asked me if I would be willing to share my color profile so here they are. I should warn you that every display will have it’s own characteristics so my color profiles will probably not be 100% accurate for your display. I would recommend you to use DisplayCal to import and manage these profiles, this way you’re sure that the profile will always be applied. Simply install DisplayCal, ignore ArgyllCMS installation and go to file, load settings and import the zip files. Then click on install profile next to the drop down menu and set as system default. You can find my two profiles here. One is for sRGB emulation mode and the other is for wide gamut mode.

Display uniformity

My unit has a very uniform image with only the left side showing slight vignetting when looking at a uniform color.

Backlight bleed

Bleed can show if a panel isn’t mounted in it’s chassis well since pressure points on the panel will show through as dark spots or highlights. Lenovo has done an great job on my unit as hardly any glow is visible. When looking at a black screen at a 2s shutter speed (compared to 1/4th on the uniformity black image above, so overexposed by 3 stops), slight clouding can be seen with most of it visible at the bottom left and top right. In person though, I can only see the bottom left bleed on a black background. This result is better than both 27GL83A’s I’ve tested before.

Backlight bleed (overexposed by three stops)

Off-angle glow

IPS display all suffer from glow when you look at them from an angle. Below are two images where the first one shows a worst-case scenario (45 degrees up and to the side). This image shows a dark red/brown glow which is comparable to the 27GL83A I reviewed earlier. Looking at the display from a 45 degree angle to the side shows very little glow.

Motion handling

This monitor supports up to 165Hz, interestingly LG didn’t include this setting in their own product. The monitor also support Freesync and G-Sync compatibility. Connecting it to my Nvidia GTX1080Ti enabled G-Sync automatically but there is one issue currently.

G-Sync issues

The monitor suffers from moments of having a black screen when framerates vary a lot. It looks like the display has issues when switching between LFC mode to regular mode and from regular to 165+ Hz. First time I noticed this I was in a game of CS:GO and while opening the buy menu, the screen went black. This to about three seconds and then it returned. For more investigation I ran Battlefield 5 at 200% resolution sclale and max details which resulted in a 30-50fps range. While playing I noticed several moments where the monitor when black and even mentioning “Cable not inserted”. When the display then went into standby it got connected again and everything resumed as normal until the next time. I’m not sure whether Lenovo is responsible or NVIDIA has a driver issue currently. My unit is running firmware LG1.1.
To my understanding, most/all of the people with this issue are running a 10-series NVIDIA gpu so AMD and 16/20-series owners might have no issues.
Turning off G-Sync also fixes the problem but will of course introduce tearing.

Motion clarity

So does 165Hz on this display have any benefit compared to 144Hz? I do not have the equipment to measure response times but this website does and they have measured the average response time to be 5ms, down from 6.02ms on the 27GL850. For a 165Hz mode to have any benefit, pixel response times have to be 6.06ms or below so being able to push the average response time down should help here.
The display has three modes of overdrive Off, Normal and Extreme. Interestingly, the extreme mode doesn’t look too bad when running at 165fps but this quickly changes when the framerate lowers as much inverse ghosting appears.
In order to compare how different modes compare I’ve takes several photo’s. They were taken at 1/60th for 144Hz and 165Hz and 1/30th for 60Hz. Several pictures were taken while panning the camera in sync with the ufo’s and the best ones were picked for comparison.

165Hz

First let’s take a look at 165Hz, the image remains sharp and as you can see setting overdrive to Extreme adds some additional clarity but also introduces some inverse ghosting. This is pretty minimal though so playing a game 165fps or more is definitely possible with this setting set to extreme although artifacts will be visible.

144Hz

Switching over to 144Hz, the image remains very sharp in motion but having overdrive set to Extreme introduces a lot more inverse ghosting to the point where I would consider this unusable.

60Hz

Dropping all the way down to 60Hz will of course introduce quite a lot of blur. These picture were taken at 1/30th of a second instead of 1/60th as to keep the shutter speed roughly half of the refresh rate. With overdrive set to Normal the image remains quite stable and no overshoot is visible. Setting overdrive to Extreme is completely unusable at this refresh rate though.

Response times compared to 27GL83A-B

When looking at a side-by-side comparison between it’s noticable that Lenovo’s further tweaks to overdrive has indeed resulted in a slightly clearer image in motion. The black lines on the ufo have slightly more contrast which is also true for the complete image. This is also noticable when comparing both in person even though both displays are already excellent in this regard.

Conclusion

Lenovo’s LEGION Y27Q-20 is a very capable monitor, I feel they have improved over the 27GL850 and 27GL83A by improving motion handling as well as a nicer stand. Color performance is excellent in both wide-gamut (after calibration) and sRGB applications. The current issues with NVIDIA’s G-Sync compatibility are a concern though and I hope Lenovo or NVIDIA will be able to provide a fix in the near future. It would also be great if the monitor would come with some form of gamma controls since stock settings are not ideal.

Pros Cons
• 165Hz is a nice bonus over LG.
• Slight improvement in motion clarity because of this and better tuning.
• Great all-metal stand.
• sRGB mode is very accurate.
• Excellent performance after calibration.
• Integrated 3-port-USB hub.
• 3.5mm headphone jack with mic input
• G-Sync issues on 10-series NVIDIA.
• $50 more expensive than 27GL850.
• Out of box gamma results not great.
• OSD not showing under 100Hz.
• Cable management difficult due to low connection points.

I do this stuff for my own enjoyment but if you are feeling generous you can buy me a cup of coffee.

Lenovo Legion Y27Q-20 black screen fix

In my review of this monitor I mentioned the issues regarding G-Sync on 10-series NVIDIA gpu’s like my 1080Ti. While running games or apps with highly fluctuating framerates or dropping below 60fps, the screen would go black for a couple of seconds or sometimes even go in stand-by mode. With the help of several forum posts and Reddit user u/Tup3x I can provide you with a temporary fix until (probably) NVIDIA fixes the issue.

This guide requires you to edit the EDID (extended display identification data) provided by the monitor using a tool called Custom Resolution Utiliy. The process takes just a couple of minutes and all changes can be reverted quite easily. If you do manage to mess up something and not get an image through displayport you can always plug in the HDMI cable and revert your changes from there. That being said, I’m in no way to be held responsible if you do manage to permanently mess something up. Let’s get going then, shall we?

After downloading CRU, unpack it to a folder on your desktop. In this folder you’ll find the main executable CRU.exe and some other files which we don’t need right now. Open up CRU and you’ll be presented with the folowing.

Step 1

I’ll be highlighting all the buttons you need to press or items you need change/input. So first, make sure the monitor is set correctly from the dropdown menu on the top left. Also make sure it says active so you know it’s the on currently connected. Press the Edit… button next to it to open the following menu.

Step 2

From here change the V rate to 60 and press OK.

Step 3

Next you have to press Delete all which will remove all Extension blocks. If you wish to use audio from your display, click Add… to add a new Extension block. If you don’t need audio in/out from your display then you can continue at step 12.

Step 4

Make sure CEA-861 is selected and click the bottom Add…

Step 5

Select Audio formats and proceed by clicking OK.

Step 6

Click Add… to continue.

Step 7

Copy the values from above and click OK to add it.

Step 8

Make sure the newly added format is added to the list and click OK.

Step 9

Then add another Data block by clicking add and this time select Speaker setup.

Step 10

Make sure Front left/right is selected and click OK.

Step 11

Check that you have two Data blocks present and click OK.

Step 12

Back in the main screen click Add… again to add back a 165Hz mode.

Step 13

Change to dropdown to DisplayID and click Add.

Step 14

Select Detailed resolution and click OK.

Step 15

Change all highlighted values and make sure the rest match the ones above, then click OK.

Step 16

Confirm that it has been added and click OK.

Step 17

Again, confirm that there is one Detailed resolutions entry with 1 resolution and click OK.

Step 18

Confirm all values look like this before finalizing your adjustments by clicking OK.

Step 19

In the CRU folder you’ll find two restart utilities, you’d probably want to run restart64 but if you’re still on a 32-bit-operating system you should open restart. Your screen will flicker as the ‘new’ display device is detected. Then make sure you’re still running at 165Hz and that G-Sync is enabled.

After this you should be all set, enjoy G-Sync! If you wish to revert any changes, simply run the reset-all executable.

I do this stuff for my own enjoyment but if you are feeling generous you can buy me a cup of coffee.

LG 27GL83A-B review and comparison to ASUS PG279Q

Trying to pick out a monitor in Europe has been a rollercoaster this year. LG announced the 27GL850 early this year and expected release date would be somewhere at the end of semester two. Having owned a DELL U2515u for the past couple of years I was eager to switch to 144Hz but buying old tech present in most 144Hz 1440p monitors for nearly the same price it has been since launch seemed like a bad idea.

Delays and doubts

It took until September to find any 27GL850s in the wild and it’s still hard to come by today. Many reviews have come out since and while it has great motion handling it has some limitations.

Wide gamut displays are somewhat limited in a Windows enviroment since many applications and games aren’t color managed. This results in overly saturated colors which in my opinion are undesireable. Setting the monitor to sRGB emulation mode seems to fix this luckily but also locks out the ability to set a white point amongst other settings.

Introducing the 27GL83A-B

Somewhat under the radar, LG also introduced a cheaper alternative to the 27GL850, the 27GL83A-B. This version omits primarily the Nano coating giving the 27GL850 it’s wide color spectrum and therefore giving it a native sRGB color spectrum. Another feature that have been dropped is the two-port USB 3.0 hub. That’s basically it.

Features

The monitor features a 1440p, 144Hz, 10bit (8+frc) IPS panel with a 700:1 up to 1000:1 contrast ratio produced by LG. It has a Displayport 1.4 input, two HDMI 2.0 inputs and headphone output on the back. The display features Freesync and G-Sync compatibility.

The stand is height, tilt and pivot adjustable and feels very sturdy, VESA 100 mounting is also an option. Rotation is sadly not included in the stand’s features. The monitor has a 4-way joystick to control the interface which is responsive and easy to navigate.

Build quality

The monitor is made out of a plastic shell and feel pretty sturdy, no obvious things to note. The stand is plastic on the outside with a metal subframe and has no obvious wobble.
The joystick used to control the monitor feels nice and clicky. Pressing the button opens the OSD, moving it horizontally give quick access to volume controle and moving it back and forth shows brightness controls which I think is a very useful feature.

Picture quality

Out of the box

The monitor comes preset to gamma mode 2 which is the factory calibrated mode. This mode has a high white point and low contrast. (700:1 on my unit) I do not recommend leaving it on this mode. The other gamma modes are much better and setting it to mode 1 instantly makes an improvement to the white point and contrast which is now at 897:1. Mode 3 and 4 are higher gamma modes and produce quite a bit of black crush on my unit where it is hard to distinguish very dark shades of grey. White detail seems to be ok but again some clipping is visible.

For a pre-calibration report I set the monitor to gamma mode 1 and set RGB to 49/49/50 respectively as the default values showed a green hue to whites. Below are the results of the stock monitor.

Contrast 847:1
Maximum dE2.43
Average dE 1.5

These results are already very respectable and no further calibration should be required for a good experience. The biggest issue lies in the gamma result which show it not completely tracking the sRGB gamma curve. This shows why near white and black shades can look indistinguishable. Color temperature is very even across all brightness levels and the gray balance shows a hint of green, this is also noticable by eye if you look hard enough.

Post calibration

The monitor has been calibrated with an X-Rite i1Display Pro colorimeter using DisplayCAL software. DisplayCAL is using the “LCD White LED family” correction with an sRGB gamma target.

Calibrating the white point gave some mixed results, following a D65 white point resulted in a slightly cool looking white. This might have to do something with the DisplayCAL correction. Setting it by eye to a slightly warmer tint resulted in a measured white point of 6401K, not too far off a D65 target. Continuing with calibration resulted in very promising results.

Contrast859.5:1
Average dE0.32
Maximum dE0.97
sRGB gamut95.3%
Adobe RGB gamut66.6%
DCI P3 gamut68.6%
Min brightness60cd/m2
Max brightness375cd/m2
27GL83A-B color gamut compared to sRGB (dotted)

Gamut coverage is pretty good, the missing gamut consists of some slight under saturation in the reds and pinks. This result was achieved by setting the monitor to the values listed below and applying the generated correction profile. You can find my .icc profile here, there is a greyscale image included for you to check if the correction works for your unit. Apply the profile and check to see if you don’t get color casts on grey shades.

R49GammaMode 1
G49Black stabilizer50
B50Contrast70

Calibration also solved most of the black and white clipping but shadow detail is still a little limited compared to the U2515u and PG279Q.

Uniformity

I’ve tried two unit, the first one had an issue where the white point was noticably more blue compared to the rest of the display. My second unit did not have this issue but suffered from a slightly worse uniformity. I’ve been using IPS displays for the past fifteen years and this model performs pretty much equal to others I’ve owned.

Black
A fully black image shows some minor bleed in the bottom left corner an very slight bleed in the top right. This is only noticable on a mostly black image in a room without any lights on. Turning on a single light or having an image with any contrast on screen and you’ll barely be able to notice it.

White
White uniformity is pretty good but it does suffer from a slight bit of vignetting. My unit has a slightly lower bottom right corner which is proven by the uniformity measurement below. Again, this is only noticable on a mostly white or bright uniform image and almost impossible to see with regular usage. Some slight white point deviation is visible but nothing to write home about.

Motion handling

UFO blur test

The main selling point of the 27GL83A-B is of course it’s claimed 1ms response time. Several other reviewers have measured average response times of about 4.8ms and only being able to get down to an average of 2.7ms when setting overdrive to “Faster” which results in some serious overshoot. Leaving it at the default “Fast” setting is luckily good enough for a clear image in motion.

Connecting the monitor to a GTX1080Ti allows the option to enable G-Sync and I can confirm this works very well. No tearing is visible and the experience is very fluid. Playing Battlefield 5 with framerate fluctuating between 95 and 143 results in no visible stutter.

Motion compared to PG279Q

Having these two monitors side by side is an interesting experience. Motion on both monitors is very smooth and the difference between a full G-Sync experience on the Asus compared to G-Sync compatible on the LG is not noticable at all. Having Windows mirror it’s desktop on both shows that the LG has an every so slight advantage regarding total lag. Scrolling a web page in this setup I can notice the LG beginning to move every so slightly sooner, I don’t think this is something to base a decision on though.

Motion blur however is a slightly different story. The Asus has a slightly older panel and thus slightly slower response times. Even though the response time difference is under a ms, dragging around something of high contrast reveals that the LG has less blur. However, this difference is so little that I do not see a reason why a PG279Q owner should upgrade because of it and I expected more of it to be honest. Below are results of the UFO test done by moving my camera in parallel to the display at a 1/60th shutter speed. Several pictures were taken and I picked the best ones.

Another thing to note though is that the ASUS offers support for black-frame insertion which strobes the backlight in sync with the display. This only works up to 120Hz but enabling this option results in much crisper motion at the cost of no G-Sync, lower brightness and a risk of headaches.

Image quality compared to PG279Q

There are several thing to note when comparing these two displays. First of all is the out of the box quality. The ASUS clearly pulls out ahead here for me, there is no issue with black and white clipping and the image looks very natural. Here are some results after calibrating.

Contrast973:1
Average dE0.23
Maximum dE0.76
sRGB gamut99.8%
Adobe RGB gamut75.8%
DCI P3 gamut82.5%

Contrast and sharpness

The PG279Q has a higher contrast ratio compared to LG’s offering but in practice this is negligible.
The PG279Q does offer a lower pixel sharpness compared to the LG. When viewing them side by side the LG’s pixels look more crisp in comparison. This does not mean the PG279Q is blurry at all, just comparatively less sharp.

Uniformity and brightness

The ASUS has a pretty uniform brightness, on par with other IPS displays I’ve used.

Blacks
Slight backlight bleed on the top tight of the display, only noticable when you look for it and are in a dark enviroment with a dark image on the display.
White
White is more uniform compared to the LG, white balance looks very even across the display and there is not vignetting effect. The top of the display is slightly darker and a little more yellow but this is hardly noticable in regular use.

Brightness
Both monitors offer similar brightness, the LG gets a little brighter and the ASUS gets a little dimmer. These are the values after calibration.

LGASUS
Min brightness60cd/m257cd/m2
Max brightness375cd/m2 350cd/m2

Off-angle glow comparison

IPS displays are know for having some form of glow when viewed at an angle. Both monitors exhibit this behavious but the LG monitor does a better job at limiting it. The LG takes on a slight reddish hue when looked at from an angle and the ASUS a much cooler tone but way brighter.

Color performance compared

When viewing the same images on both monitors side by side it’s pretty easy to see that the ASUS has a wider color gamut. When looking at images with a lot of grass or images which have fire or glowing elements it’s easy to see how the ASUS monitor saturates those colors more. If you’re looking at a pure sRGB color space this is not required for accurate colors but visually the ASUS has more “pop” when comparing them directly.

Other things to note

The ASUS and LG both feature an anti-glare coating and they both look very similar. It’s not very coarse and doesn’t make the image look grainy at all on either.
The ASUS has built in speakers and a USB hub as a bonus, I enjoy having two extra USB ports but the speakers are seriously trash and using them for anything except a back-up solution is not recommended at all.
The ASUS has a more adjustable stand which has very smooth rotation and some red LED lighting if that’s your thing. It does wobble a little bit more compared to LG’s stand.

Direct comparison photos

Below are images taken of both monitors side by side taken with the same camera settings and edited the same. Both monitors were set to 200cd/m2 and white balance was corrected to match in post.

Conclusion

When comparing the ASUS and LG to one another it’s obvious to see the differences but I feel like it basically comes down to this.
If you enjoy playing competitive games more then you do creative work and media consumption/creation, then the 27GL83A-B is the obvious choice with it’s better motion handling and still excellent image reproduction.
However if you like to still have a competitive advantage over 60Hz and even other 144Hz displays but are also into photography/videography and use the monitor a lot for watching movies and shows then maybe go with the PG279Q (or any of it’s successors).
Besides that, the ASUS usually is the more expensive one by a lot and if you weigh that into the equation the choice becomes pretty clear. I got lucky and was able to try out the PG279Q for the same price as the 27GL83A-B so that makes my decision a lot harder.

I do this stuff for my own enjoyment but if you are feeling generous you can buy me a cup of coffee.

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