The mamiya lenses are good. Some are excellent, some not quite as good as the best Hassy or Contax Zeiss. It's a quibble more than anyhting else. Some very fine photographers, such as Charlie Cramer us them for gallery quality fine art landscape work with a P45.
Michael
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To that, I'd like to add that going back in time, history, even, I used to have a 180mm Sekkor (?) for a TLR Mamiya body and then, when I managed to 'upgrade' to a Hasselblad, the first additional lens I bought was a 150 Sonnar. Well, in my opinion as a user, the Mamiya lens was a far nicer optic, for being that wee bit longer (better perspective for head/shoulder shots) as well as for its bokeh, though none of us knew at the time that that was what it was. (Imagine a winking emoticon here.)
Also, pre-digital, Hasselblad lost out big-time to Mamiya's 6x7 format with lots of top fashion and advertising photographers; I doubt it was all simply to do with format and these are lads to whom money had long ceased to mean anything...
Just a thought - Rob C