I've found that my Leica lenses out-perform any others when looking at the negatives with a loupe. I regularly print at 16x20" from them and have excellent quality prints. There is of course much more room for error when printing at this size from a 35mm neg than a 120 or sheet film, but again and again I am surprised at just how good the prints are. I've printed 810 negs to 20x24 and had much crisper looking prints of course, but when looking at the negatives there is a clear difference.