This is a review for the 17mm.
I used to own it before it was stolen. Awesome, awesome lens. Only complaint I had was the infinity hard stop wasn't calibrated right, but other than that, worked super well.
Here's 2 shots I've taken with it on full frame.
and here's one on a crop body (where it works like a distorted 28mm f3.5)
Have a nice day, Bluename.