The other piece of gear I'm considering dropping some coin on at the moment, I've been eyeing the Mamiya 200mm f/2.8 APO for my 645. My applications will primarily be portraiture and cycling photography. The most relevant question at the moment seems to be, what is performance like wide open? I asked this question ages ago on photo.net, but figure I might as well ask it again here as hopefully more users have surfaced in the ensuing years. Anyone here have it/use it? Any example photos? Thanks.