What the F@#% !??

After shooting some indoor low light work with the MkII and my 24-70 2.8L, I noticed a disturbing trend my subjects were out of focus and the background was in! Could it be? My dream camera backfocusing like my measley 10d did when I first got this lens?


Just to be sure I gave the lens to a friend with a MkIIn and he got the spot on sharp test results. Arrgh! off to the shop goes my rig...