Halo 5 is amazing in native 4K and 60 fps.
My Gold trophy goes to the Witcher 3 for best 4K enhanced game. For Witcher 3 to go from 900p to 4K native is a huge accomplishment. I played through Witcher 3 in 2016 and was blown away, but when the Xbox One X enhancements came out I did a second playthrough…and oh my gosh man the game is absolutely stunning in every way. The HDR is stunning as well.
If I had to pick a third place it would be Portal 2. That game was 540p on the Xbox 360 and now in native 4K running on my TV at 60fps. Those annoying jagged angles that the original was plagued with are gone, the detail increase is enormous, and honestly Portal 2 is one of my favorite games ever, so playing it again in 4K has been a great experience.
So my list of top 3 would be;
1.) Witcher 3
2.) Halo 5
3.) Portal 2
What is yours?