I think part of the problem with looking at these new super high resolution screens is that unless you are using an application that can make sensible use of the resolution you are really unlikely to see any significant difference. when it comes to web browsing and office applications, you have to make everything bigger just to be able to see it properly. So yes you might get smoother fonts, but then I don't really have too much trouble with aliasing etc when looking at a display at about 100PPI. Yes the 300PPI display on my Galaxy Note 3 is super smooth, and being only around a 6" diagonal I tend to use it a lot closer than my desktop monitor. I had a look at a 4K IMac in the local Apple store recently, and as was said could not initially tell which one it was without asking a member of staff. I had a quick look at Aperture, as of course they do not have any Adobe products installed on demo machines. I could not actually find any RAW files in the demo library, which I think was shared with the normal IPhoto program, so was having to look at JPEGs. OK full screen 100% view was quite nice, but as was said not really mind blowing. Of course given the fact that the display was at factory default settings (I guess) and not accurately profiled its hard to say what it would look like if correctly set up in "normal processing conditions".