I dont see why would anyone want to use a 4k tv as pc display, with all the input lag issues and non gaming oriented display, non pure-pc design choices etc., when you got the Philips BDM4065UC, a 40" 4k VA @60hz, display port 1.2, any gpu capable, superb contrast ratio and black depths, no lags, and easily does chroma 4:4:4 @4k 60hz, like this test shows:
(cant post links yet, check geeks3d chroma subsampling uhd test)
I done it and can clearly see all text lines, no blurry lines whatsoever in the PNG image.
Also the price is right , I dont see anyone looking any further, such panel is for 10 years at least, definitely the upgrade of the year. Untill all the manufacturers catch up and play around with ultra wide 200hz displays, I sit and wait, nothing currently comes close in terms of all around pc display quality.