On my 7D, focus is fast and accurate (after AFMA).
+1 I bought my 7D from an owner who was getting soft pictures. He couldn't have understand how to use it or used cheap lens on it because for me I have had nothing but sharp images.
- keep the shutter speed high and use the factory defaults (except for using the AF expansion point)
I bought my 7D new. I had "soft" focus issues from the beginning. Not so much you could tell from the LCD on the camera screen, but enough to ruin photos once viewed from your PC. They were NOT sharp. I have shot with several camera bodies (I own the XT, XTi, T1i, 40D, 50D, 5D2...) and have several lenses so this is NOT my first rodeo, so please excuse my post if you disagree that some 7D's have a "soft focus" issue.
I have several excellent quality lenses from Canon (some L) and my focus issue was with all of them and ONLY on my 7D. After 4 months of frustrating photos I sent my camera back to Canon. Their conclusion? My AF sensor was misaligned and needed adjustment. The result??? Perfect focus and super sharp images. (All within a week of sending it in.) I posed a scan of my repair order to "prove" my claim.
The "soft focus" problem is REAL for some models of the 7D. Does it affect ALL of them? No. But, Canon took care of the problem and fixed it under warranty. Am I unhappy with my 7D? NO!!!
It is a great camera and like all sophisticated electronics, it is subject to occasional problems and fixes from time to time.
I think it is unfair of you to claim that "focus issues" are solely user error and not perhaps a real problem. (Google this for yourself! It IS real!!!) Or perhaps I didn't "understand" my 7D before Canon looked at it, who knows? Just my 2 cents...