Summary: This is so sharp that it's hard to describe. Color rendition and contrast are excellent and the little bit of vignetting / distortion is easy to fix in LR5. I use the f1.8 - 55mm version of this for portraits and and this lens for everything else on mt Sony A7S.
Summary: This lens restored my confidence that Zeiss primes are the best. This lens feels like the cheap $99 Canon 50mm F/1.8 "Nifty Fifty" - meaning it's small and light (although 8X the price of the Canon) But once you put this on the Sony a7r camera - this lens shows details with minimal distortion and almost no chromatic aberration. This harkens me back to the 1980s when I used to shoot a Contax with Zeiss glass on all manual mode.
The build quality is great (mine was marked made in Japan)
18 October 2014
Summary: I bought this solely to make my A7S as portable as possible so I could get rid of my canon G1X. The build quality is great (mine was marked made in Japan), lens hood is well designed (one I will actually use). Pictures come out great, decent Bokeh (as much as can be expected for an f2.8), excellent corner to corner focus. I really wanted the 55mm f1.8 FE lens, but it was just too big to be pocketable.
a must have lens for the A7R - incredibly sharp, small and lieghtweight.
John Chandler, Amazon
10 August 2014
Summary: this is a must have lens for the sony a7r, its super sharp, tiny and lightweight. there is some vignetting on wider apertures. uses a 49mm filter. this is a great lens to keep for all occasions.