How much would I gain from upgrading my Nikon D5100 to a Fujifilm X-T4?

I mostly stick with the small primes on the Fuji and they’re excellent. I have the 16-80mm F4 zoom as well and it’s fine for quick travel photography but not a patch on the primes.

I did another quick test as I got a bit worried about the sharpness. But good news: The apparent lower sharpness of the X-T4 was just caused by it’s more accurate autofocus :D.

I was auto-focusing on a plush mammoth on the shelf below (cropped out in the montage above), which is a bit closer to the camera than the books. It seems the Nikon was backfocusing a bit resulting in the books being sharper but the mammoth on which I actually focused being less sharp, compared to the Fuji.

Here are the ISO 3200 images including the mammoth (left is the X-T4, right the D5100):

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