If you have a 48" 4k, then you're running it at 100%/96 dpi, just as if you had a 24" 1080p or a 27" 1440p. Same density, just more pixels.
If I was ultrarich, a 48" 8k would be the best of both worlds. It would also murder game performance, but oh well.
I have UI scaling disabled on my 27" 4k display and it looks fine to me.
If you have a 48" 4k, then you're running it at 100%/96 dpi, just as if you had a 24" 1080p or a 27" 1440p. Same density, just more pixels.
If I was ultrarich, a 48" 8k would be the best of both worlds. It would also murder game performance, but oh well.