Soldato
27" is in my opinion too small to fully appreciate 4k uhd , yes they look nice and better than lower res screens for content but 4k content on 32" monitors to my eyes looks much better. its a suck it and see thing. (almost litrally)
27” is too small as I don’t want it 30cm or less from my eyes. 32” is THE perfect size for 4K on a desktop. 43” is too big and reduces the ppi too much.
I was on about the size of the screen and viewing distance, I haven’t looked at 4K on less than 40” and that was a tv not a monitor, so to me that’s irrelevant, some 27” do look small because they are so thin they look like 24”, but then some 32” can look smaller than they suggest too, it’s the style of the screen that matters more.