4K UltraHD Display: Dell UP2414Q
See the review of the Dell UP2414Q 4K UltraHD display over at diglloyd.com (as well as the wide-gamut professional NEC displays).
A 4K UltraHD display is a radical viewing experience with the right source material, see for example the diglloyd publications which utilize 4K UltraHD images.