I’m on my second 4k laptop; tbh I wouldn’t want to go back to a “normal” HD screen. The support for them in windows wasn’t great when I got the first but under windows 10 it’s absolutely fine. I do very occasionally find the odd program that doesn’t play nicely out of the box; but there are options to force it to scale up appropriately.
They are great for viewing photos / recalibrating images etc; but I’ve never used it for zoomed in detail work. I would imagine the interpolation effects that MrSmith mentions wouldn’t really be a problem – you just need to x2 zoom and you’ve got an effective 1920×1080 resolution.
I scale mine up a bit; but not quite x2 – so I get more screen estate for a trade off in size – however I find it much easier on the eyes for long working sessions (I’m a coder) – text is smoother and easier to read imo