Sharp GR8 vs SAMSUNG S90F (WOLED)

Sharp GR8 in its promotional materials boasts of "very high brightness" at a level of 500 nits. Unfortunately, our tests showed that reality is somewhat different – the average luminance we were able to achieve was around 360 nits. This is rather an average result, especially in the context of the manufacturer's claims. Such brightness does not allow for a full enjoyment of HDR effects. The image is a bit sharper than in standard SDR, but it's hard to talk about true vibrancy and depth of bright elements here. However, the coverage of the DCI-P3 colour palette at 95% deserves praise. This is the result of applying an additional PFS coating, known from QLED technology. As a result, colours are vibrant and have a pleasant, natural tone, which partially compensates for the shortcomings in brightness.

Does the S90F handle not only blacks but also bright parts of the image? Definitely. The stories about OLEDs as "dark screens" can slowly be regarded as myth. The Samsung S90F, like the LG C5 based on a very similar panel, achieves brightness exceeding 1000 nits. This is a value more than enough to enjoy impressive and dynamic HDR images – both in movies and series. Most of the scenes we tested look stunning, with well-defined highlights and high contrast. Of course, OLED technology still has its limitations – in very bright, full-screen sequences, such as the test card from the movie The Meg (photo 5), the television may noticeably dim the image. However, it should be emphasized that such scenes are rare. It can be said that the HDR effect is good enough that even mid-range OLED models like the S90F can provide a cinematic experience in the home living room.

At the beginning, it's worth noting that colour reproduction tests are always conducted in the best factory picture mode. In the case of Sharp GR8, this is the “Film” mode. When it comes to white balance, which affects how we perceive colours on the screen, in SDR mode the strong dominance of blue immediately stands out. This results in an unnatural cooling of the image – blue elements take on a purple hue, and skin tones appear to have a pink tint, which we can see in the comparative photo from the film STAR WARS. During the Color Checker test, it was clearly visible how the colour samples deviated from the standard values, confirming significant errors in colour reproduction. The gamma was also not ideal – it caused excessive brightening of the entire image, causing the scene to lose depth and proper tonal transitions.

In the 4K HDR mode, the situation looks much better. The dominance of blue is much less noticeable, although there are minor issues with the blending of red and blue. This makes some shades look slightly unnatural. The EOTF curve, which is responsible for image brightness in 4K HDR content, showed another problem – the TV tends to excessively darken the image across the entire surface of the screen.

To summarise, the “Film” mode in Sharp GR8 would require some adjustments in order to fully utilise the potential of this television. Fortunately, we took care of this and proceeded with calibration.

Samsung S90F, like most modern televisions, offers many picture modes, but – following our testing tradition – we checked it out in the best one, which is the Filmmaker mode. Thanks to this, the image looks much more natural than in the default, often oversaturated settings. It was neither overly saturated nor artificially dimmed – simply closer to what one should see. Of course, “more accurate” doesn’t mean “perfect”. Unfortunately, our S90F had significant issues with white balance, particularly in the blue color range, resulting in a slightly yellowish filter being applied to most scenes. Someone might say it looks more “filmic” – because it’s warmer – but let’s not kid ourselves, George Lucas didn’t film Star Wars in sepia 😉 (you’ll find a comparison with the scene below as always).

Additionally, in HDR materials, there was an issue with brightness management. The EOTF curve showed a clear “spike” in brightness – the television brightened the image more than it should have, causing some effects to look too intense and deviating from the reference. Fortunately, some of these problems can be eliminated through professional calibration – you’ll read about its effects later in the review.

Sharp GR8 is one of those televisions that really gains a second life after proper calibration. Both in HD and 4K content, the white balance performs very well, especially considering this model's price segment. The picture becomes significantly closer to what the director intended to show – colours appear natural, and skin tones gain the right depth and warmth. The brightness characteristics also leave a very positive impression. Both the gamma and the EOTF curve demonstrate really solid values. While slight imperfections can be noticed, they are subtle enough that it's difficult to see them during everyday viewing. In summary, calibration allows Sharp GR8 to show its best face, offering a picture that is not only pleasant to the eye but also faithfully conveys the creators' intentions.

After calibration, we managed to eliminate practically all the previously mentioned errors. Older movies in SDR quality finally look like they should – without the sepia effect or artificial aging of the image. The atmosphere of the classics is back in place (no thanks needed, Star Wars fans), and the colours no longer resemble an Instagram filter.

One of the key changes was also the improvement of brightness characteristics in HDR content. We managed to control the EOTF curve in almost a reference manner. Admittedly, the most demanding users may detect minimal deviations in brightness, but honestly – most viewers won't even notice that. And it's no surprise because the vast majority of errors fall below the ΔE 3 value, which is below the threshold of visibility. After calibration, the S90F (WOLED) becomes a truly excellent display – one on which you can enjoy nearly perfect image quality.

Sharp GR8 is equipped with a feature called "10-bit colour reproduction," which theoretically should improve the smoothness of tonal transitions. In practice… well, the effect is surprising, but not in a very positive way. Even at the highest settings, it’s hard to notice any impact on the actual tonal transitions. Instead, the feature surprisingly smooths out things it shouldn’t - walls, shirts, or other flat surfaces look almost as if they have been ironed. In the test, we had to note that there is simply no actual impact on tonal transitions.

When it comes to image scaling, Sharp GR8 performs significantly better. The television can give the image a plastic, smooth characteristic, making even lower resolution content look quite good. Of course, with more demanding details, such as thin branches of trees in the background, you can see slight jaggedness, but it’s not something that would significantly affect the viewing comfort.

Digital Image Processing in S90F:

Fortunately, Samsung, like in most of its models, manages to effectively tackle the unwanted posterisation effect in the S90F. The function responsible for this element is noise reduction, which does a pretty good job of smoothing tonal transitions and eliminating unnatural colour blending – of course, within its capabilities. Unfortunately, it works quite aggressively, so using it comes with trade-offs. In addition to improving gradation, it can also remove film grain or slightly soften facial features. In this case, the choice is yours – do you prefer a more "clean" image, or do you care about preserving the original texture of the material.

Image Scaling in S90F:

In this year's model, Samsung has implemented its proprietary AI processor – NQ4 Gen3, which really handles upscaling quite well. In our test scenes, the TV effectively "pulled up" lower quality towards artificial 4K – the image was more enjoyable to view, and the differences in sharpness between native and scaled content were minimal. Unfortunately, behind all this AI marketing façade lies a certain shortcoming. The S90F struggles with overscan. If you reach for truly archival material – e.g. a VHS tape of your parents' wedding – you have to reckon with the fact that the lower part of the image may get cut off. The function to adapt the image to resolution simply does not work as it should here.

This is where Sharp GR8 has the opportunity to stand out against the competition in its price segment. The television is equipped with a 144 Hz refresh rate panel, which is an impressive result, especially if we plan to use it for dynamic content such as action films, sports broadcasts, or video games. Additionally, the manufacturer has included a motion smoothing feature, commonly known as a 'smoother'. The user has three levels of adjustment available, allowing them to tailor the effect to their personal preferences – from subtle smoothing to a more aggressive intervention in the fluidity of the image. It's a nice addition, particularly for those who mainly watch films and care about smooth, cinematic sequences without annoying judders or stuttering.

S90F really handles motion excellently – after all, it’s an OLED with a 144 Hz panel, so sports and games look absolutely stunning on it. The image is smooth, clear, and there’s no room for ghosting or blurring, which can sometimes plague cheaper LCDs.

The TV also comes equipped with motion smoothness settings that allow you to customise everything to your liking. We have motion blur reduction and judder reduction – you can set it so that the image is super smooth (even to the point of looking a bit soap opera-like), or more cinematic, with the classic “jumpiness” of 24 frames. The choice is yours, Samsung imposes nothing.

If the television has a 144 Hz panel and two full HDMI 2.1 ports, it’s clear it was designed with gamers in mind. The Sharp GR8 offers exactly that – high refresh rates and the right connections to get the most out of modern consoles and PCs. It also features ALLM, which automatically switches the TV to low latency mode, and VRR, ensuring the picture doesn’t stutter even in more demanding moments. In practice, everything works as it should, and it's difficult to find fault. However, it’s not without its shortcomings. There’s a lack of support for HGiG, which better adjusts HDR for games, as well as Game Bar, which makes it easier to quickly adjust settings without leaving the game. Despite these drawbacks, the Sharp GR8 is a really solid option for gamers.

When it comes to gaming features – the S90F has absolutely nothing to complain about. Aside from the lack of Dolby Vision, which is already the norm for Samsung. The television operates at 144 Hz, has four HDMI 2.1 ports, so you can easily connect more than one console or PC. Onboard, we also find Game Bar – a practical tool that allows you to quickly preview picture settings, VRR status, ALLM mode, and other useful options. Game Motion Plus deserves special mention – Samsung's proprietary motion smoother that actually works sensibly in games. The image appears smoother, but without any artificial effects or slowdowns.

It's also worth mentioning the HGiG feature, which – and this may be a slight surprise – works correctly. We bring this up because Samsung clearly messed something up in one of the recent updates, and in some models, the option responsible for HGiG simply... disappears from the menu. Setting it up becomes almost impossible. Fortunately, our S90F unit did not have this issue, but the situation is dynamic, so it's worth keeping this in mind and regularly checking for new software versions and information from the manufacturer.