Know monitors:
Dell UltraSharp UP2715K, 27" inch screen, 5120 x 2880 resolution and 218 ppi. Uses double DisplayPort 1.2 input. Dell UltraSharp UP2715K cost is around $1500 and it is already available.
The VP2785-5K is ViewSonic's first 5K monitor. It's 27-inch screen delivers 5120x2880 resolution, and covers 99% of the Adobe RGB color space, making it suitable for demanding graphics and design applications.
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The dell is 'only' 1000 euros now in europe: http://www.amazon.de/Dell-UP2715K-Monitor-DisplayPort-Reaktionszeit/dp/B00R420SU4/ref=cm_cr_arp_d_product_top?ie=UTF8
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