A57 vs 7D IQ

Had a chance to compare both cameras, found them mostly equal in IQ, but one case I struggle to understand - I shot a framed painting with A57 and 7D at 3200 ISO and A57 wins hands down in contrast, details and sharpness looking at 100%. Used 50mm 1.4 on Canon and 50mm 1.8 (much cheaper lens) on A57.
Shot as RAW converted to Jpeg in iPhoto using default settings.

Looking for comments which would help me to understand why a budget Sony camera beats high end Canon?
Pics: https://www.dropbox.com/sh/4ukftzs1girjzcn/IpRT8TT9xF