The LG C1 OLED is the 2021 replacement for the LG CX OLED. As expected, it's an amazing TV, but aside from a few minor tweaks and upgrades—like the new 'Game Optimizer' settings, a redesigned Magic Remote, and a new version of WebOS—it performs about the same as its predecessor. Like all OLED TVs, it has self-lit pixels that can be turned off individually to produce an almost infinite contrast ratio, with dark inky blacks and no distracting blooming around bright objects.
LG TV Forum testing also confirmed that, unlike the higher-end LG G1 OLED, it doesn't have LG's new evo panel. Despite these quibbles, the C1 still has a lot to offer, including a new setting for lower input lag, as well as a near-instantaneous response time and variable refresh rate (VRR) support.
  Sony A80J OLED TV

The Sony A80J OLED is a high-end OLED TV. It sits below the Sony A90J OLED in Sony's 2021 lineup, and although there are a few drawbacks compared to the higher-end model, like worse HDR peak brightness, it still delivers stunning picture quality, especially in dark rooms. OLEDs can turn off individual pixels, resulting in a near-infinite contrast ratio with no blooming around bright objects. According to sony a80j vs lg c1,  the LG offers a bit more for gamers, with two more HDMI 2.1 ports than the Sony and it has lower input lag. The Sony, however, has better out-of-the-box accuracy, although this can vary from unit to unit.
  Sony A90J OLED TV

From LG C1 VS. Sony A90J, we know that the LG C1 OLED and the Sony A90J OLED are both amazing TVs. They each have OLED panels with near-infinite contrast ratios and perfect black levels. That said, Sony can reach higher peaks of brightness in both SDR and HDR. The LG, however, is the better option for gaming since it has FreeSync support and lower input lag, while the Sony is G-SYNC compatible.