This is my first fish catch ever.
8mm setting, f/5.6. Academic Bookstore in Helsinki.
I really like the handling of the lens, there isn't the usual slop in the manual focus ring as far as I can tell and both rings operate smoothly. The hood is attached with a lock at the side of the hood which is excellent - unlike the 70-200/2.8 FL's hood lock the fisheye's lock has to be pressed before the hood comes off. I view this as an important security measure.
Unexpectedly I find the circular fisheye views more pleasing than the frame-filling ones. I find that the intersection of curved lines and the curved image boundary is more natural than when the curved lines meet the rectangular boundary in the 15mm setting. But I'm sure I will find use for both settings.