The '4K revolution' has been a little slow to migrate over from HDTVs to computer monitors but Dell's got something for the pixel-obsessed in their 27-inch 5K display which it is selling for US $2,500. Dell's boasting a 5120 x 2880 resolution at 218 pixels per inch, which is the equivalent of what MacBook Pro with Retina Displays have but scaled to 27-inches. As cutting edge as this monitor is, the high price does limit it to the professional segment of the market. This looks like a great companion display to a new Mac Pro.
Source: Dell