There is already a huge difference between FPS boost and not. This will have all those changes and more considering they have the headroom to turn the sliders up even more. It will be native 4k60 instead of forced 1080p and significantly lowered visual settings because it's forced into the One S profile with boost. The One X update that made it 4k increased LoD ranges significantly. It's enough of a visual and IQ difference that after switching back constantly the first two days I started replaying, I had to settle and just got use to just playing in 4k 30 without boost. It just looks like a giant smear filter at 1080p on a big TV
EDIT
If you don't care for achievements try the mod for 4k60. It seems to hold up ok.. I think 98% of the time. I tried to stress test it in the Boston area and it seemed fine. You will have to disable the fps boost
In the mods section search for: Xbox Series X ultra settings
View: https://i.imgur.com/rbpb4J0.mp4
EDIT:
although now I wonder if it is 4k
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