I work on a desktop with a 1920 x 1200 display, and I'm quite happy with that for the time being. But I do have some images on my website, with @2x versions for Retina/HiDpi, and they look absolutely amazing on iPads and smartphones. And I wonder if you might have to assess sharpness differently when working in PS/LR with these displays? As it is now, I can predict pretty well how much sharpening is needed for printing (offset or inkjet), and I'm thinking that it might be easy to oversharpen when working on a hi-res display.