100% 16mm coverage. I may be mistaken, but I believe the PL lens mount is exactly the same for 35 and 16. Someone please correct me if not. The problem would not be the mount, but rather the circle of coverage that the lenses provide. Even if the 16mm lens barealy covered 35 (and it's not uncommon for lenses designed for a smaller format to have significant extra coverage) it would still be pushing the limits and you would have very noticable vignetting. Essentially, the corners of the image would show significantly poor quality, and the image would not match with lenses designed for 35. That said, you could use that to your advantage! I would be very curious personally how these lesnses look on a larger format. Anybody know of a test?