I had a similar situation....I had/have a Canon 50mm f1.4 and found a DR SUmmicron without goggles and in need of cleaning for a bargain price so I tried it. I like it a lot more to the point that I don't use the Canon anymore. The DR isn't the prettiest lens, but it takes nice, sharp images down to f2. The only bad thing about the DR is that it weighs a ton....lots of brass and glass.