Its less than Apple's version, but at the same time I doubt they'll have the quality. I'd take an HP IPS any day.
It also really disappoints me that only very few of the companies in the monitor game realize the need for massive pixels.. Using a workstation on a 30+ display with a low resolution is just pointless to me..
I hope the Dell U2711 or U2710 whatever it is, is just a copy of the Apple 27" iMac screen.. Or that Apple brings the 21.5 and 27" to a monitor product line.