Some normal marks on the black rubber from use. 

Optics are really almost perfect except a micro dot in the front element which you almost can't see. Doesn't effect image quality in any way! I've tried to include a photo from my iphone of the mark but it's very hard to see and tricky to capture. 

I've also included some images shot with the lens very recently including one aiming at the midday sun to show that the sun's flare is even and consistent across the frame as it should be on such a fisheye.