I think that the lenses are probably consistent... has anyone who thinks that this lens is sharp seen the results alongside those from a Rodenstock HR or a Schneider Apo-Digitar on a 50 or 60 Mega-pixel back, at 100%?
Good question but I wouldn't expect them to be anywhere close. Surely none of the film glass, zoom or prime, could compare favorably to a digital specific lens from either of these MFG.
When deciding if a lens is sharp or not I tend to take the fact that it is film and zoom into consideration. Even so, I find the 55-110 at 110 close enough in sharpness to the 120 prime that you would be hard pressed to see the difference on a properly sharpened image. Perfectly usable for large format (single frame printed 30x40-40x60) landscape work which is what I do.
I have done resolution chart comparisons with the 55-110, 80, and 120 with the P30 but have not tested them against my schneider glass or the P45 since I recently received both. The P30 is noticeably soft compared to the P45. When I get my P65 next month I will go through the process again and will include the digitar glass in that mix for comparison.