Personally, 5120x2880 27" running at 2x is perfect (well, except that it's 16:9 instead of 16:10, but one can't have everything I suppose). Anything lower (e.g.

Personally, 5120x2880 27" running at 2x is perfect (well, except that it's 16:9 instead of 16:10, but one can't have everything I suppose). Anything lower (e.g. 1.75x or 1.5x) would make UI elements unusably small for me. I don't own one of those LG's, but I do have an iMac that uses the same display panel and it's by far the best desktop class display I've ever used in every regard but refresh rate. The only problem is that it's tied to the iMac with the integrated Intel hardware aging like milk. The LG display has myriad issues which make it a terrible purchase for the money, so it's not a good alternative. For me the awkward point are 4k 27" displays: not high resolution enough to run at 2x, too high resolution to use at 1x, and smudgy text at any fractional scale. I really wish that 5k 27" would replace 4k 27" entirely in the market.