My Canon P had a few advantages over the Leicas I usually used, but wasn't as durable. The 50mm f/1.4 it came with was a dog compared to a Summicron. Retinas aren't nearly as rugged as Leicas. I've never owned a 50mm f/2,8 Elmar, but one in a test of about 30 lenses of its day was one of the very best. The f/3.5 Elmar lagged behind Summicrons.