I want 4K but I don’t want to use scaling, and when trying it out on my 42" TV I had to use scaling, but I have done it only for text in my Ubuntu:
gsettings get org.gnome.desktop.interface text-scaling-factor 1.2
Scaling text only seems to be better then scaling the entire window, because this way I don’t loose real estate.
I am not still convinced about using 4K, due to the need of going with a very big screen, because 32" seems to small and the ideal size may be above 50" and that is huge.
Another think that bothers me is to be able to concentrate in only that part of the 4K monitor that has the window I am working on and ignore the rest of the space.
So, I am inclined to just buy 3 or 4 good quality Full HD monitors with thin bezels and have them in that multi-monitor stands.