99.9% great. Text looks wonderful, almost everything has hi-resolution icons in the correct size. It's not easy to find things to complain about.
My workflow hasn't really changed since upgrading — I still prefer to focus on one or two windows (often with the "Always on Top ᨑ" button) and just see more code/webpage in that window.
Under KDE's display settings, I have the scale set to 2.0.
Problems:
- Minor UI issues. Some UI elements in Amarok don't quite line up correctly. The loading dialog of LibreOffice is at 50% size. GIMP's toolbox buttons seem small. The default steps of shrinking/enlarging text in Konsole aren't great.
- As far as I know, the HDR capability of the monitor isn't supported in Linux.
- About two years ago when I last tried, mixing resolutions with multiple screens didn't work correctly.
If you use a desktop, and can afford to upgrade all its screens to 4K together, I recommend doing so tomorrow. Investigate further if you'd be mixing resolutions; see if you can borrow one.
Referring to [1], I have a UHD-1 screen, which is much rarer than I thought. Just 1.2% of Steam users. The more-common WQHD screens could be OK without any scaling.
