Are we talking Switch original releases only or including ports? Breath of the Wild, Mario Odyssey, and Splatoon 2/3 look excellent, and Okami HD is a great port/remaster that arguably looks better than the original. I haven't bought Monster Hunter Rise yet but it looked stunning in the demo. And of course there's beautiful 2D games like Dead Cells, Hollow Knight, etc. I've found that a lot of Switch games look really good, even launch games from 5 years ago, with really the only flaw in most games being a lot of aliasing.