While I don't own either, I did recently make a purchase from Adorama. Inside the box was a catalogue along with a review of the different versions of the 50mm ( both Nikon and Canon). They weren't trying to figure out which company made the best lens, but were the higher priced versions that much better. They quoted the chief scientist at DxO Labs questioning the real benefits of the faster lens. I think you can go to the Adorama website and look in the learning center part.Search for 50mm shoot-out.