Fact is, everybody makes good lenses. The difference between "excellent" and "the best" is real close. Too close to tell the difference in most cases. Besides, "the best" is so subjective, it's really meaningless.
I use Leica rangefinders for most of my 35mm shooting. The lenses are great but I don't use the cameras for the lenses. I like the small size of Leicas compared to my Canon EOS SLRs. In most cases, the pictures I've done with the autofocus Canon lenses can't be distinguished from the Leitz lenses.