I don't think I expect pristine image quality in any first-party Nintendo game, even on a console that ships with DLSS support, as their developers seem to ignore basic features like 'anti-aliasing' and 'texture filtering' in favour of cheap post-process options but at least Donkey Kong Bananza looks acceptable on a 4K TV, at least from the YouTube footage I've viewed on my LG C3 OLED.
What really disappoints me though is that Nintendo always seem to take one step forward and two steps back when it comes to implementing any new technologies so VRR is supported, kind of, in handheld mode but is completely absent in docked mode. Personally, I am only interested in playing Switch 2 games docked as I don't particularly like the LCD screen - I don't care what anyone else says, it is a massive downgrade from the Switch OLED's screen - so it has been docked ever since the initial setup. That said, Nintendo still managed to mess up the handheld experience by not running the game in a 120 Hz container, so LFC is not supported, and also using double-buffer v-sync instead of triple buffering so the game hard drops from 60 to 30 fps when it dips to 59 fps or lower and VRR is completely disabled when the game dips below 40 fps (so it is S-S-Stutter City regardless of whether you are in docked or handheld mode) as shown in the DF tech video.
I am hoping these issues won't be too much of a distraction for me as this game is one that I have been itching to play ever since I saw the reveal trailer. It is exactly the kind of Nintendo game that I really enjoy and looks to be a spiritual successor to the awesome Super Mario Odyssey, a game which I have spent the most time replaying on my Switch 2 since I got the console at launch.