Samsung S95H 77 inch is probably best overall, QD-OLED, latest panel, low input lag. No Dolby Vision though and has matte coating. Matte coating does a great job with reflections but you may prefer something glossy. Would check out before buying to see if you are OK with the matte coating. Also it has a huge silver frame around the screen which you may or may not not like.
Sony A95L 77 inch is still out there are still great. Older QD-OLED, gets bright but not as bright as today's top models, but still has a great picture. Supports HDR10 and Dolby Vision but not HDR10+. Only two HDMI 2.1 ports and more lag than competing brands, but even then it's ~16ms at 60hz vs ~9ms for other brands.
Samsung S90F in North America should be the QD-OLED version, so has the color and brightness benefits of QD-OLED vs WOLED but at a midrange price (check model number, if it ends in FXZA it's QD-OLED, if EXZA it's WOLED). Glossy screen instead of the matte coating Samsung uses on their 2026 OLEDs. Should mention here that game mode will need some minor tweaking in the options menu to get an accurate image, this goes for S95H as well. Good value.
If you're looking for a good bargain Panasonic Z8BA 77 inch is on Amazon and is being sold for $1499 and sometimes goes on sale for $1299. It's a third party seller but shipping and support is through Amazon. It's a rebadged Panasonic Z93A from 2024 so similar panel to LG C4 (WOLED) but with Panasonic processing. Should be a bit brighter in HDR than your CX but not as much of a jump as the QD-OLED TVs. Supports all HDR formats, has accurate color out of the box and input lag is as low as LG and Samsung. Unfortunately like Sony it only has two HDMI 2.1 ports. It's very heavy too, ~100 lbs due to built-in sound bar.