These polls seem to always get more and more specific... "What fixed focal length, 120mm image circle, non-Tessar design lens"...

Anyway, last SLR lens purchase would have to be a 40mm Distagon for Hasselblad. Ah ha! See, no mention of 35mm in THIS poll...

Last 35mm lens purchase was a 50mm Noctilux (not SLR, sorry) which turned out to be a lemon - so I can tell you where NOT to buy used Leica gear in Milan.