Nay bother

It's weird, with the exception of Apple 4k or greater displays seem to have caught the market a bit off guard. Display connections have lagged behind, media standards haven't kept pace (4k blu-ray STILL isn't here yet), software doesn't really seem to know what to do with all of that space... heck, Windows STILL doesn't support hi-dpi displays particularly well with a slightly cludgy approach to the whole thing. In short it's a mess, though in fairness the mobile industry seems to be a doing a much better job of keeping pace with the tech (though as they tend to be the ones making the screens you'd expect them to know what to do with them!).
Things will likely improve considerably over the next couple of years. 4K TV's will start coming with high dynamic range as standard, content providers will catch up, Windows 10 must surely introduce better scaling options along the lines of OS X's method of handling retina displays and while 8k is on the horizon it's likely far enough off to give 4k time to properly establish itself. In the PC market 5k and 8k monitors will offer interesting solutions to content creators but they're also going to be fairly specialised. The real trick will be getting graphics cards that can run 4k games without needing big dual slot cooling solutions but it's inevitably going to come sooner rather than later.