The HP DreamColor Z27x is a top-end monitor, intended primarily for designers and other creative types who need serious colour accuracy. At this point it may seem a stop-gap before OLED monitors are within reach of those without a company credit card and an “anything goes” expenses policy. However, it’ll be a while before that changes.
Dell’s 30-inch 4K UP3017Q OLED monitor, if it's ever released, will cost $5,000 in the US—and judging by the pound’s recent behaviour, we wouldn't expect it to be much cheaper than £4,500 over here.
from HP DreamColor Z27x review: A serious top-end monitor, but no good for gamers