This decision (Canon 28 f/1.8, Sigma 30 f/1.4, Canon 35 f/2.0) has been driving me nuts for a long while.

I'm on a crop, so corner sharpness matters less (and means I can include the Sigma) but it's a 60D, so I don't have AFMA (which should rule the Sigma out).

Whilst it seems that the Sigma is the better lens, the question is, is it worth the hassle of finding somewhere to get it calibrated (is that even possible)? Or should I, even as a beginner (first picked up a camera in anger in Apr '11), consider one of the MF options in this area?

That's also without mentioning that the Sigma only SEEMS to be the better lens, nowhere on-line can provide a definitive answer, and most places rate all but the L lenses in this range pretty poorly.