I didn't realize the Zeiss MTF charts were on this site! Thanks. Actually, the old 200 f3.5 figures look pretty comparable to the current 180 f2.8, though of course it is not as good as the new 200 f2 (nor does it cost nearly as much). MTF charts are helpful, but don't tell the whole story of a lens, as you know. I don't have any experience with the new 200 f2, but I find the 200 f3.5 subjectively (looking at slides from both lenses) just a little - very little - behind the performance of my Canon L-series 200 f2.8 for EOS, and that is one of the better 200s to be found.