Well I just tried a loaner of a 33-55mm fa lens on my 645D,
I went and and shot my normal test subject the barn house, and to make a long story short the lens is back at the Post Office on it's way back to it's original owner.
I am not pixel peeper I don't shoot brick walls or churches like diglloyd does, that to me is not a good landscape test. To me this is my "acid" test. It has everything I am looking for when I shoot landscapes.
This was actually taken with my M9, but my point is this is where I have been testing all my lenses for my 645D, and as of today I am getting my best results with the 75mm FA, 120mm A, 200mm FA, and acceptable results with my 45-85mm FA at 45mm shooting all these lenses at F11-F16, and doing some capture sharpening in ACR or Lightroom.
My next test will be the trying a 6x7 45mm F4 lens using the 67 to 645 adaptor on order from Japan.
Steven