OK, shot with a buddy Saturday morning and he knew I'd just gotten the siggy... He has the 50L so we did a quick shoot off.... Funny thing, we used my body because my siggy was adjusted on it and we knew it'd work. Yeah, well his L was back focusing worse than my siggy was front focusing before the calibration... So his shots are all slightly OOF...
I'll be posting them later (in a new thread in the lens forum). Oh, and ignoring the focus miss on the L, the siggy is right there with it optically. I used to think the canon 1.4 was close enough to save the money, but now after seeing the siggy? Yeah, it's certainly good enough.