PS: modified text after merging the two threads on the 6-element K/AI lens. The link to Roland's website was already included so I have removed that one too.
Herewith a few shots taken yesterday-evening after receiving my copy of this lens. All hand-held taken with D750. No 1-3 at ISO12.800, f4, 1/60. No.4 ISO200, f8, 3sec (and moving the camera in circles). I would have pushed aperture and lower shutter speed if I had a tripod with me but I did not. I also wanted to see how the lens performed at 2.8 and 4 instead of its - apparent- sweet spot of f8.
Processing: import NEF into LR with Nikon Standard camera profile, pushed shadows a bit, no NR (except for LR's standard color NR) to see how it works out. #3 is cropped and I removed some other reflections to put emphasis on the one seen in the photo