I had a go at farcry6 last night, got to the beech, 4k all maxed settings with a 3080TI, memory usage just under 11gb, to be honest I couldn't see any degradation in texture quality or anything, nothing blurry. Seemed to run fine, I turned a few settings down from Ultra to high and boosted my FPS by 5-10 with zero effect on image quality, prior to that however all on ultra still not degredation.
I was amazed running around on the beech and getting around 75fps at 4k with such impressive graphics, ray tracing on too. The benchmark makes the game look cack compared to the actual game.