I went from 2 1440p to one 32" 4K and 1 1440p.

It's been one of the biggest productivity improvements since moving from 640x480 to 1024x768.

The 1440p is now only used for minor stuff like email and not really necessary anymore.

I soon moved to a 32" 4K at home as well, because I just couldn't stand just 1440 anymore.

One of the interesting parts is that I don't use 4K fully: it's too much surface are and your head tilts too much to see everything at once. But what's great is that I can put a background process as full screen in the background and have a 3500x1800 window in front in which I do my real work. So I can observe the proceedings of the background talks without having to toggle windows all the time.