I set up my display using the settings from the rtings review of the display, and found them to work quite well. If you put it in a preset that emphasizes sharpness, text looks awful, but leave it in its default mode or make some tweaks and text looks just fine.
I run at native 3840x2160 resolution. I can see menu items well enough when I need them. From there on text-heavy apps I bump up the font size a bit. For example in Apple mail, I bump up the default font sizes by 2pt or so. In my browsers, I bump up the zoom a notch or two. The text is still very legible to me. Those tweaks let me sit back comfortably in my chair and read.
It’s syllabus writing season, so I’ll be staring at text all week and referencing a bunch of documents. The screen real estate offered by full 4k has been a game changer when writing.
If you prefer to use a scaled resolution, connecting with a DisplayPort cable with an adapter/hub via one of the thunderbolt ports on your Mac will give you the option of a scaled resolution of 3008x1692 which looks great as well. Personally, I think a step between that and full res would be ideal, but it’s not an option(maybe with a third party utility app).
The 2560x1440 scaling doesn’t look too bad either, but screen elements are way too big for my taste. Even though it’s the ‘native’ pixel doubled resolution 1920x1080 looks awful in my opinion unless you push the screen across the room.
Before I picked up this monitor I was bouncing between 21” 1920x1080 and 23” 1680x1050 monitors for extra screen real estate, so the 32” 4k panel was a huge upgrade. If you’ve been on only retina displays for a good while, you will find the lower pixel density much more noticeable.