Calvin Lee , Apr 01, 2008; 08:18 p.m.
I have had the same experience with the 45mm C, Cs, & N. The 35mm lens is even softer on the edges. Here's one I took with the 45mm Cs:
And one I took with the 35mm C:
I agree that the 55mm lens is very sharp from corner-to-corner. Other Mamiya 645 lenses that I have found to be very sharp are the 70mm Leaf-Shutter & 110mm f/2.8.