Whatever I say about this lens is not enough.
First of all, the size is so small and lightweight. An ideal combo for traveling.
The quality is exceptional.
The reviews say it all.
Personally, I didn't encounter any problems.

The major downside is the price. Nothing else. However, all full frame e-mount lenses are very expensive.
The saying "you get what you pay for" applies in this particular case.
Anyone who gets it will not regret it.

The characteristic of the lens is its size. In the A7II, it protrudes slightly from the grip. The fact that it is 2.8 is a bit concerning in low lighting conditions, but a faster lens would also have implications on its size. The colors have the characteristic pop of Zeiss.
I think together with the 55mm, it is one of the essential emount lenses that you should have.

*Update 05/07/2017*
I sold it at some point because I thought I didn't need it. I had bought the 28mm 2.0 and thought it was slightly wider and brighter for half the price => definitely better.
Big mistake. The photos were flat, lifeless. I bought the 35mm 2.8 again and now I appreciate it even more. My favorite E-mount FF lens.