I have heard that there is a lot of sample variation in this lens but my copy was perfect. Very sharp in the center even wide open. A little softer in the corners but never unusable. OSS works great. Terrific colors and Micro Contrast.

It's hard to describe how much I like the A7r - but one of the things that comes with it is that punishing 36MP sensor. I knew in my heart that a mid-level (but premium priced) zoom lens would not be perfect - but my hopes were high.