Im most interested in the size of the pixels.
at the present 72 dpi is the standard whereas the Macbook and the new ipads have 326 ppi
the overla screen dimensions mean less to me that the detail per inch.
http://www.amazon.com/ASUS-PQ321Q-31-5-Inch-4K-Monitor/dp/B00DJ4BIKA
I’ve found that one which says 140ppi, but it’s a huge monitor. I’d imagine if you scale that down to 22” or so it’ll be much higher dpi. I’m not sure any that small are out quite yet to really know, but they should be coming soon.