I am currently researching my next lens purchase and have come across quite a bit of discussion on the same type lens having much different image quality. It just depends on if you happened to purchase a good "copy". Some guy on another site was selling a
70-200 f2.8L and said this "particular copy was by far sharper than his previous four copies". Can this be legit? Do the same lens's vary that much in quality? That's kind of scary in my opinion.
What say you?