I have a mixed set of old and new, consisting of 45, 75, 90, 135 and 400/4. The 75 and 400 are old type, the others new. I cannot really see much wrong with the older lenses, and handling wise they are all the same to me as well. As others have said, these are mighty fine lenses. I plan on getting 200/4 and maybe 300/4 lenses eventually. What I need first is a set of extension tubes. I suggest you get that as well, as the minimum focus distance on the macro (and all the others, for that matter) can be a bit limiting.