LG 55 B4 vs Samsung R85H / R86H

The brightness results in HDR materials LG B4 are very good. It is true that none of them exceed 1000 nits, although the luminance stability is excellent and looks practically the same in every scenario. The only moment where the tested television performs worse is the last scene, although this should not come as a surprise. Large frames filled with a lot of white have always been, and will likely continue to be, somewhat of a weakness for OLED televisions. However, the combination of perfect contrast, black levels, and brightness in the LG B4 allows for a full spectrum of the HDR effect. Additionally, the incredibly high coverage of the DCI-P3 colour gamut, which reached 99%, deserves recognition. As a result, colours look incredibly vibrant and stunning.

When it comes to brightness, the R85H performs quite well. In most of our test scenes the TV reaches around 800–900 nits, and with larger bright elements it can exceed 1000 nits. These aren't, of course, on the level of the most expensive Mini-LEDs, but they're more than enough for watching films and TV series in HDR and the effect can be quite noticeable. The problem reappears in more demanding scenes, where there's a small bright element on a very dark background. Here the TV can greatly reduce its brightness to avoid lighting up too much of the screen. In our measurements such small highlights fell as low as around 200–250 nits, so it's clear that a limited number of local dimming zones combined with the specific behaviour of the algorithm has consequences here. Fortunately, it doesn't affect viewing all the time. In typical, mixed HDR scenes the R85H looks good and can provide good image dynamics. It's just that with very small points of light you shouldn't expect as strong an effect as on TVs with a much larger number of zones or on OLEDs.

The best factory mode prepared by the manufacturer is "Filmmaker," and we used it throughout the entire testing procedure. We must admit that the unit we received straight out of the box had quite decent colour reproduction. The biggest issue in both SDR and HDR content turned out to be white balance. In the former, there was a strong dominance of red, resulting in a noticeable yellow tint in the displayed image, particularly evident on skin tones and whites. In high-quality materials, this colour was also pronounced, but due to a lack of blue, there were also signs of green visible. Besides these shortcomings, we also encountered issues with greyscale and the colours themselves.

In Filmmaker mode our R85H sample in SDR performed adequately, but a few issues immediately stood out in the measurements. In the white balance, as brightness increased more red was added while blue decreased. As a result, the brighter parts of the image had a slightly too-warm tint. Gamma only held the target value at the start. It then gradually fell, which left most of the image a little too bright. The combination of these two factors also affected the colours, with errors growing particularly in the brighter and more saturated samples. It did not look bad, but for Filmmaker mode we expected a bit more accuracy. Interestingly, our sample fared noticeably better in HDR. The white balance was much more even and the individual components stayed close to one another across most of the range. Only in the brightest parts did red start to be lacking, causing white to shift subtly. The EOTF curve looked very good, tracking the target luminance across almost the entire range. That does not mean HDR colours were perfect. The Colour Checker still shows some deviations, especially for some of the more saturated colours, but the errors are clearly smaller than in SDR.

LG B4 has been providing very advanced calibration tools in its TVs for years. We can even say that as the only manufacturer on the market, it allows for such deep intervention in image adjustment. Thanks to these, we were able to calibrate the device so well. The evidence of this is the extremely low deltaE errors, which can be said to stand at a reference level. Both SDR and HDR materials now look exactly as the film director intended. It is no coincidence that TVs of this brand are most often used as preview screens for various graphic or post-production studios.

After calibration the R85H shows it has really substantial colour reproduction capabilities. SDR performed best: white balance could be brought almost perfectly into line, and gamma stays very close to the target value across most of the range. That also translated into very low errors in the ColorChecker, so there's really little to criticise here. HDR also shows a clear improvement, although some issues can't be corrected as well. At the highest brightness levels the character of the backlight itself becomes apparent and the individual components of the white balance begin to diverge. The same applies to the most saturated colours, which don't always land exactly where they should. Despite these limitations the overall picture is considerably more accurate than factory settings, and the biggest difference is definitely visible in SDR. However, there is one thing calibration can't fix. With heavily saturated elements the colour can slightly bleed onto adjacent bright areas of the image. It's easiest to notice on white, which can pick up a faint tint of a neighbouring hue. It doesn't occur in every scene, but when the material is demanding the effect can be visible. This is more a feature of the way the RGB backlight operates than an issue with picture settings.

In this paragraph, we will take another look at the tonal transition smoothing feature, but we will also check how the TV handles lower quality material. As we have managed to check, the setting responsible for smooth gradation works quite effectively, although it has its weaker moments. While the feature works well with SDR content, it becomes less useful with HDR content. Even at the lowest of options, it blurs essential details, so we advise against using it.

The image scaling on LG B4 is rated fairly moderately positively. Although there is no edge splitting, the image itself is naturally "soft". We can change this by adjusting the sharpness slider.

In the R85H, image processing is handled by the Micro RGB AI Processor. The name is new, but when it comes to upscaling lower-quality sources, the TV's behaviour is very similar to what Samsung has shown before. And that's not a bad thing, because Samsung has handled this aspect quite well for years. Lower-resolution material is displayed cleanly, edges don't become overly soft, and the TV doesn't try to artificially extract detail at all costs. The result is simply balanced, and for regular TV or older recordings the R85H performs as you'd expect from Samsung at this level. There's still a small downside: overscan, which can't be completely switched off at the lowest resolutions. Another matter is the extra processing applied to low-quality sources. The R85H can smooth posterization and tidy up heavily compressed footage, but it's worth emphasising that it does so relatively aggressively. At stronger noise reduction settings it starts removing not only compression artefacts but also fine detail and the natural film grain. So it's best to use it only when the source actually needs it.

The maximum refresh rate we can set on the LG B4 is 120 Hz. This is the absolute minimum for those who require high image smoothness. The manufacturer has implemented a multi-level motion smoother called "TruMotion". It has been divided into two separate sliders that adjust the sharpness of moving images (De-Blur) and stuttering (De-Judder). Both sliders can be set in the range from 0 to 10, with each level affecting the degree of smoothness, so everyone can find their sweet spot.

The LG OLED B4 panel features an average response time of 0.1 ms (which directly results from our measurements), allowing for an incredibly clear image, unattainable for LCD TVs, which have response times of even several milliseconds. This can be clearly seen in images from the "UFO Test", showing no trace of blur trailing behind the object.

R85H has a 144 Hz panel, so motion handling is really good here. You should remember that the extra hertz above 120 will mainly be used when connected to a computer, so in this category we don't treat them as any particular advantage. For films and TV, what's more important is that the panel is fast enough to provide access to an advanced motion smoothing feature, "Motion Clarity", which lets us set motion from more film-like to very smooth. The panel's response time is a bit worse. Since it's a VA panel, fast-moving objects can leave a slight trail. On a bright background this isn't very noticeable, but the darker the scene, the more noticeable the smearing becomes. This is a typical characteristic of this type of panel and it's easiest to spot in dark scenes.

The LG B4 television is equipped with four full-fledged HDMI 2.1 ports with a full bandwidth of 48Gbps. All functions corresponding to this standard activated without any issues, and throughout the entire testing procedure, they caused no problems. The combination of such extensive functionality and low input lags leads us to say that the tested television is truly designed for gaming. This is not surprising, considering that the manufacturer has always placed great emphasis on this. Therefore, we can enjoy both a properly implemented HGIG mode and gameplay in Dolby Vision with low latency. Such a tandem will surely attract the attention of all passionate gamers for whom quality is the most important.

A standard feature in televisions from the Korean manufacturer is also the implementation of GameBar, allowing for quick adjustments of settings "on the fly," without the need to exit the game. It also enables image adjustments for individuals with visual impairments, which is an extremely nice touch. Another important piece of information is that when the VRR technology is turned on, we will not experience a drop in contrast. This is, of course, due to the construction of the panel and the lack of conventional backlighting. However, it is normal for shades of grey to flicker slightly, although this is a characteristic feature of this function regardless of the manufacturer and the television.

In summary: The LG B4, like all OLEDs from the manufacturer equipped with 120Hz panels and HDMI 2.1 ports, creates a harmonious whole with the console. In practice, it is a complete television, and if we expect the highest possible efficiency in gaming, the B4 will be the ideal choice.

Samsung has been steadily expanding its gamer features for several years, and the R85H really doesn't lack anything important. The TV supports 4K at 120 Hz, VRR and ALLM, so it can easily make full use of the PlayStation 5 or Xbox Series X. HGiG also works properly, so when HDR is set correctly on the console, games maintain their intended brightness and you don't unnecessarily lose detail in the brightest parts of the image. The only bigger omission is Dolby Vision Gaming, which Samsung doesn't support on any of its TVs.

The Game Bar is also very useful, a handy menu you can bring up without leaving the game. You can quickly check the frame rate, VRR status or change the key picture settings. Samsung also includes a few less obvious features, like the ability to change the aspect ratio or Game Motion Plus, which can further smooth games running at 30 or 60 fps. Of course this comes at the cost of higher input lag (around 55 ms), but for slower-paced titles it may be an interesting option for some.