The LG C9 and CX are two very similar televisions. This is already noticeable in the design of the devices. When switched off, they are almost indistinguishable.
Technically, not much has changed either. The picture quality is equally convincing on both units, but the C9 can get a little brighter and has a slightly better viewing angle. In return, the CX has better built-in speakers and the Black Frame Insertion feature is available at 120 Hz, which wasn’t the case with the C9. So both devices are excellent TVs with only slight differences and will satisfy most users.
All in all, the LG CX is the better TV than the Samsung Q80T. Thanks to OLED technology, the CX clearly scores higher in terms of picture quality due to the significantly better black and higher contrast ratio. Samsung’s QLED simply can not keep up with the response time of 0.3 ms, even though this incredibly low value can lead to stuttering. But this is not a real flaw, as it is very easily corrected by motion interpolation.
However, the Q80T has a lower input lag in game mode and can also be used better in bright rooms due to its better maximum brightness and more pleasant reflection handling. There is also no need for a disturbing Automatic Brightness Limiter to reduce the risk of burn-in, as is the case with the CX.
The Sony AG9 is the better choice especially as a home cinema system. The comparison chart doesn’t suggest this because the AG9’s essential characteristics can’t be considered in our calculation. The picture quality of both devices is equally convincing, allowing HDR content to be reproduced brilliantly; however, the AG9 has more sophisticated image processing than LG’s competitor. But the big plus of the AG9 is the Sound from Screen feature, which only the AG9 has so far. This allows the TV itself to become the centre speaker of a sound system, and the sound comes directly from the centre of the screen, creating a real cinema atmosphere.
Unfortunately, the AG9 is not really suitable for gamers, because important features such as VRR or a low input lag are missing and it does not support HDMI 2.1. Gamers who want to buy next-gen consoles should therefore rather go for the CX.