They each have OLED panels with near-infinite contrast ratios and perfect black levels. That said, the 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.
Is the C2 OLED worth it?
Its self-emissive technology is superb for watching movies or HDR content in a dark room. It’s also brighter than most OLED panels, making it an excellent choice for watching TV shows or sports in a bright room, and the image remains accurate at a wide angle, so it’s great for a wide seating arrangement.