Don't know much about the Mamiya or any medium format SLR for that matter, as I'm a dedicated Rolleiflex TLR man myself.
Have a search on Google, there is plenty of info. there. The prices seem a little high for the 645 pro series, especially when you compare them with a good S/H Hassi.
But give me a good Rollei TLR with a Zeiss 2.8 planar lens any day, they don't come much better than that.
JimP.
JimP.
"So little time, so much to do, so many places to visit".