LG OLED G6 (G64LW, G66LS) vs Samsung S90H (QD-OLED)

The LG G6 is currently one of the brightest OLEDs on the market. Its peak brightness reaches nearly 2500 nits and, best of all, this translates directly to real movie scenes. The TV flawlessly extracts details in the bright areas of the image. And this is regardless of whether we are talking about very small points in the form of stars in the sky or slightly larger elements on the screen. Naturally, with full-screen, uniformly white scenes, the brightness of the G6 drops due to the panel protection system (ABL). However, in real, varied movie shots, this value still hovers around an impressive 2000 nits, which can be considered a remarkable result. The coverage of the color palette also deserves praise. The new 2nd generation Tandem OLED panel has brought about only a cosmetic change, but still an improvement. The coverage of the DCI-P3 color space reaches nearly 99.5%, while the ultra-wide BT.2020 is around 84%. These are very good results, although it's important to remember one thing: at extremely high brightness levels, the volume of colors will be lower than in QD-OLED panels from Samsung Display due to the use of white sub-pixels (WOLED). However, in everyday content and most films, capturing this difference will be very difficult.

The Samsung S90H is a really bright TV for the mid-range among OLEDs. In synthetic measurements its peak brightness reached around 1650 nits. That's an outstanding result in this class, roughly 50% higher than what we’ve seen from previous models at this price point. Most importantly, these tests translate directly to real video material. In four out of the five film scenes we tested the S90H’s brightness hovered around 1300-1500 nits. That kind of headroom lets it reproduce most HDR films with very high impact and without obvious compromises, especially material mastered to 1000–1500 nits. In practice, highlights, reflections and explosions have the right punch and the picture doesn’t feel dimmed. Of course, on full-screen, very bright scenes the result is naturally lower and drops to about 900 nits. That’s a direct effect of the protection systems that keep the OLED panel from being overloaded. Even in that scenario there’s little to complain about. Nine hundred nits across the whole screen is still a very high level, guaranteeing excellent dynamics in HDR content. A huge advantage of QD-OLED TVs has always been the colours, and the S90H is no exception. The DCI-P3 colour space we measured reached a full 100% (actually 99.9%), while coverage of the much wider BT.2020 gamut hit about 89%. That’s a great result, allowing very saturated and vivid colours in HDR material. It’s worth emphasising that QD-OLED’s edge over WOLED panels isn’t just about gamut coverage. In practice it’s seen mostly in the higher brightness of saturated colours, in other words greater colour volume. That makes intense reds, greens and blues in HDR look juicier and more impressive.

We tested the LG G6 in the best factory mode for colour fidelity, which is FILMMAKER MODE. In the case of our test unit, this mode was reasonably well tuned straight out of the box. In SDR content, the only issue we noticed was the white balance, which leaned towards warmer tones. This made the image occasionally appear slightly yellowish, but overall, it wasn't a significant problem. The G6 performed a bit worse in HDR content. There, the white balance showed too much blue component. This caused the image to veer towards cooler shades, resulting in quite noticeable errors. As can be seen on our ColorChecker chart, the colours shifted towards these cooler registers. Nevertheless, considering the factory settings, the television presented a perfectly decent level. However, we know that OLED screens – particularly those from LG – respond exceptionally well to professional calibration, so we immediately proceeded to do just that.

The next stage of the test was to check how the S90H handles colour reproduction without any calibration. As always, we took measurements in Filmmaker Mode, the best factory picture setting. And here Samsung really deserves praise. The factory tuning is at a very high level, which wasn’t always the case a few years ago. The white balance was set correctly, as was the brightness response. The average colour reproduction error (Delta E) stayed around 3, which is below the level at which most viewers can notice inaccuracies. Only in the brightest shades of grey did the values slightly approach 4, but it’s still hard to call that a real problem during viewing. For out-of-the-box settings, the result is simply excellent.

After completing a professional calibration, we gained complete control over the panel, and we managed to align all parameters to nearly zero. We were able to tune the white balance perfectly, which removed the factory's cool and warm tints from the screen. The effects are visibly clear in the ColorChecker test – the average colour reproduction errors dropped below the critical value of 1-2. And what does this mean? PERFECT colours, without any distortion! However, as a reviewer’s duty, we must point out how the LG G6 arbitrarily manipulates brightness, which is due to the EOTF curve's behavior. When we look at the standard synthetic graph, it might seem that the line is quite straight. However, the situation changes when we turn on the measurement filter, which shows how the television interprets brightness in actual, moving film scenes (EOTF in MOVIES). Then, it is clear as day that some of the smallest fragments on the screen are slightly overly brightened by the algorithm. Of course, for the average viewer, such a deviation will practically go unnoticed, but in the test of such an expensive screen, it’s worth noting – especially since we are talking about a model that has huge aspirations for the title of the best television of the year.

All right, but you know we wouldn't be ourselves if we didn't also check how much we could get out of the S90H with professional calibration. And there was no big surprise. Since the out-of-the-box settings were already very good, there wasn't a huge margin for improvement. Even so, we managed to refine the image almost to perfection. After calibration the average colour reproduction errors fell below the threshold of perception, reaching Delta E values under 2 for both SDR and HDR material. We also improved the luminance response, so the picture more faithfully reflects the creators' intent and maintains correct tonality across the entire brightness range. After professional calibration the S90H therefore becomes a screen very close to reference. Will the difference be spectacular for everyone? Not necessarily. The factory settings already deliver a very high level, so in everyday viewing some people may not notice a huge jump. Much also depends on the specific unit. Our sample was very well tuned straight out of the box, but that doesn't mean every S90H will present the same level. Even identical models can differ in their factory calibration. That's exactly why professional calibration makes sense: it lets you bring a particular unit to the highest possible accuracy, rather than relying on a bit of luck when buying.

No matter what one might say about the G6's issues with near-black signal, it must be fairly acknowledged that it handles heavily compressed material and lower resolution content extremely well. All unwanted, ugly tonal transitions are effectively reduced here by the "Smooth Gradation" feature. At the "Low" setting, the algorithm works flawlessly – effectively masking the artifacts resulting from strong compression without destroying the sharpness and details in the frame. Higher levels of this feature do further smooth the image, but they start to blur the real texture elements of the objects, so we recommend keeping this slider at a low level. As for the actual upscaling to 4K, the processor does an excellent job – edge sharpness and detail reconstruction are at the highest level, and in this respect, the G6 is on par with the global leaders.

W tej kwestii Samsung praktycznie nic nie zmienił względem ubiegłorocznego modelu, co akurat jest dość dobrą wiadomością. Funkcja odpowiedzialna za wygładzanie przejść tonalnych nadal bardzo skutecznie ogranicza efekt posteryzacji. Trzeba jednak pamiętać, że działa dość agresywnie, bo oprócz samych artefaktów potrafi usunąć również ziarno filmowe i delikatnie zmiękczyć drobne detale obrazu. Jak zwykle jest to więc kwestia kompromisu i własnych preferencji. Jeśli zależy Wam na jak najwierniejszym odwzorowaniu materiału, polecamy pozostawić tę funkcję wyłączoną.

Również w kwestii upscalingu trudno mówić o rewolucji. S90H korzysta z tego samego autorskiego procesora obrazu NQ4 Gen3 co jego poprzednik, dlatego jakość skalowania pozostała praktycznie bez zmian. Telewizor dobrze radzi sobie z materiałami o niższej rozdzielczości, skutecznie poprawiając ich ostrość. Nadal jednak nie rozwiązano problemu z overscanem. W przypadku niektórych starszych materiałów, zwłaszcza archiwalnych nagrań, może zdarzyć się, że fragment obrazu przy krawędziach zostanie ucięty. To drobna wada, ale szkoda, że Samsung kolejny rok z rzędu pozostawił ten problem bez zmian.

The LG G6 is an OLED television, so in the category of motion fluidity, it traditionally deserves the highest marks. The TV supports very high refresh rates of up to 165 Hz in 4K resolution, but most importantly – there are absolutely no signs of blurring on the screen. The response time of the matrix is virtually instant, ensuring that dynamic images remain perfectly sharp.

In terms of motion handling the S90H delivers a very high level of performance. A new feature here is a panel with a refresh rate of up to 165 Hz, although in practice this will mainly benefit PC gamers. Movies, TV series and sports broadcasts don’t use such high refresh rates, so when watching them the difference compared with the standard 120 Hz won’t be noticeable. That said, thanks to the OLED panel’s instantaneous response time, motion is very clean and the image doesn’t suffer from the smearing common to many LCDs. Samsung has equipped the TV with extensive motion settings. You get two sliders: judder reduction and blur reduction, which let you easily tailor the image’s character to your preferences. You can easily achieve very smooth motion for sport, but you can just as easily preserve a more cinematic feel at the typical 24 fps. It all comes down to which effect you prefer.

The LG G6 is a true beast for gamers and one of the best-equipped TVs on the market in this regard. The manufacturer didn't compromise and equipped this model with four full HDMI 2.1 ports with a maximum bandwidth of 48 Gbps. This means that no matter which port you plug in your PlayStation 5, Xbox Series X, or powerful PC, you'll get the absolute maximum performance out of them.

The TV supports a full suite of gaming technologies: from VRR (Variable Refresh Rate), to AMD FreeSync Premium Pro, and Nvidia G-Sync Compatible. Let's add to that a remarkably low, almost imperceptible input lag and an excellently functioning game panel (Game Optimizer), which allows you to constantly monitor signal parameters. Gaming on this screen, with the perfect black of OLED and powerful refresh rates, is pure pleasure.

From the start, the Samsung S90H gives the impression of a TV designed with gamers in mind, and it's easy to see why. The maker has equipped it with nearly everything you’d expect from a modern gaming display. You get as many as four full-bandwidth HDMI 2.1 ports, support for ALLM, VRR and very high refresh rates. There's also a clear Game Bar that lets you quickly check key picture parameters or change settings without leaving the game. Another very welcome improvement is HGiG support. Last year it could cause quite a few problems, but in the S90H it works exactly as it should.

Samsung's real ace, however, is its proprietary Game Motion Plus mode. The feature works much like the motion smoothing used in films: it improves animation smoothness in games while keeping input lag at a very reasonable level. For titles running at 30 or 60 fps, with the right settings, input lag in our testing never exceeded 40 ms. That's an excellent result, especially since on many manufacturers' TVs enabling similar features results in delays several times higher. Game Motion Plus doesn't replace Dolby Vision Gaming, of course, since it's a completely different type of feature, but overall for gaming it's an addition that many players may find more noticeable. Smoother motion in 30/60 fps games often makes more of a difference than HDR itself, which, incidentally, is often poorly implemented in games.