I like that C/V 90, too - a very, very nice lens indeed.
Must say that I also personally prefer the character of the older lenses - just as well, as I can't afford the ASPHs. I also use a collapsible Elmar on my M3 - of course it's not a patch in many ways on more modern glass, but I like the look it produces. Equally, the 40mm Sumicron-C is one of my most favourite lenses, and as Leitz envisaged, makes a credible two-lens set with a 90mm.