Thanks for the reply Charlie. Canon has a flat fee of $219 so they say on the phone to fix a 5D II. Wondering if when they got it, if they'd even see that it was already meeting spec and charge a whole lot less, or more likely just tweak it some amount to charge that anyway. Managed 10 years now without ever bothering to send anything to Canon. Funny I bought the thing used very recently for $1500 thinking it made more sense to do so and save a few bucks towards lenses. Now kicking myself since I'll be at the price of new now anyway. If only it were less off I'd just live with it. But kinda pointless to fork out bucks for like the Zeiss 21 and have the camera flange to sensor plane screwing it all the hell up. Least I established it's in the cam. Guess I'll send in the 10-22 and have it cleaned and autofocus fixed just so I can sell it to help pay for the 5D to get fixed lol. I guess my biggest fear is it coming back mostly with the same issue, maybe just improved a little bit or changed its behavior at one focus distance or another. Guessing I should at least stick the 21mm Zeiss in there with it and say at least get the left and right side to match with that lens on there.
Anyway thanks for the thoughts. Surprised more haven't had this done, sorta. I bet it's a common reason people's 'lenses' seem off all the while them never even knowing it could be the body's mount to sensor. Pretty darn certain the T2i I have is off in the same exact way. The mount over a couple years of use with heavier lenses probably often gets pulled the same direction, or something.