Well I have a retina - so I know they are fantastic... what I am saying is that at normal sitting distance it's overkill for a 27" - This is retina at 41cm distance.
if it was 32" screen it's retina at 48cm ... which is closer to seated distance.
Bigger please!
http://isthisretina.com
I think that the market for the 4 - 5K is initially for creative folks rather than those who want sit and watch movies.