If you double 1920 you get 3840 and double 10. Bear with me as this takes a bit (at least it did for me) to wrap your brain around.
With a 4k display set in preferences to use its native 'default for this display' resolution, what you see visually on screen with a 27' 4k monitor is exactly the same size as what you would see on a 27' 1080p monitor. I disagree with VikingOSX on this: ' One consideration is that if you opt for a 4K display, everything will appear smaller on the screen' It is all I hoped for, and more, in that it solved the problem my previous monitor had with not waking up with my M1 Mac mini. To say that I have been pleased with the choice would be an understatement. After a great deal of reading and research, I purchased the recently released LG 27UN850-W.
