The AF on it is more reliable than any of my L lenses. I am starting to wonder if people made up the AF issues because that was the only possible attack on the lens.
Clearly your L lenses are fakes because the AF on Canon L lenses never fails - or you must be doing something wrong!
And once you've admitted that you're at fault and not Canon's L lenses, there's a line of good white stuff over here for you to reinforce that good feeling.
The issue is not people nitpicking problems with the lens since it's not Canon. Of course, that bias truly exists, but nowadays many people want Sigma to succeed.
The problem is Canon AF algorithms don't play well with third party ones very well. And Sigma is the only third party making fast primes, which are most susceptible to AF errors due to the shallow DoF.
Canon lenses have inconsistent AF too, but that is usually a calibration error that can be remedied. With Sigma it is a question of firmware incompatibility. Hopefully the Sigma dock will solve it completely, and I think it was a really great idea.
I just got another copy of the Canon 50/1.4 and this one focuses fine. But it's pretty soft wide open to the point of unusable- so more power to Sigma!