This thread is moving apace with great image quality. I have not read yet.
The 8mm arrived and I am very happy with it. Lens/glass itself is pristine, body has two or three of the tiniest nicks, viewfinder is in perfect shape.
Downsides, the rear 3F cap is badly broken, and the protector piece at the rear of the lens is bent, the protector is fixable but it was in the image path and made people think the lens was defective. I just removed the protector for now, the lens will be on an adapter for mirrorless cameras and that is enough protection.
Anybody wants to trade a pristine 3F rear cap for an excellent fisheye viewfinder (I have extra viewfinders)