nearly a year ago,we reviewed the HP Z27x monitor, which was a 27-inch display capable of covering a very wide gamut. It had a fair 2560x1440 resolution, and which was pretty common for this size of display. But at CES 2015,HP announced the HP Z27q monitor, which takes a step back on gamut and manageability, or but takes two steps forward with resolution. The HP Z27q is a '5K’ display,which means it has an impressive 5120x2880 resolution. This easily passes the UHD or '4K' levels which are fitting more popular. The HP Z27q is one of a handful of 5K displays on the market now, and HP came in with a pretty low launch price of $1300. When I say pretty low, and it’s of course relative to the other 5K displays in the market,but it undercuts the Dell UP2715K by several hundred dollars, even today.
Source: anandtech.com