There are few versions actually if you looking at the 150mm lenses to fit 645 Mamiya.Thanks. I wasn't sure since both are 2.8
3.5, 2.8 - AF
2.8, 3.5, 3.8, 4 - MF
2.8 are easiest to focus with, rest are ok too. Available light sometime is problem for medium format, b/c lenses arent all that bright (comparing to 35mm cameras).
Quality wise - i believe that its pretty much up to personal choices, b/c well.. face it - unless you using fine film and going to do drum scans or huge prints, chances of really noticing differences arent all that big, imho.
I mean i am yet to see mamiya lens that i'd really dont like in either 6x7 or 645. But then i am fairly conservative with length/apperture choices , knowing exactly what i want/need. Or may be its sheer blind luck
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