I've reread the thread and I can't see where different lenses for color/BW could be inferred. Maybe it's your avatar

AFAIK, old (and I mean old) lenses were optimized mostly for blue, the color B&W fixed graded is more sensitive to.

Anything more up to date will handle color well, of course better lenses are better. APO lenses are optimized to focus perfectly on the three basic colors - or four, the money color...

Jorge O