no i did all my testing in auto focus and no live view.
Well, you may have sent the camera off to be serviced already so it may be something of a moot point, but I think it's important to cleanly separate the possibility of the sensor being at fault versus the autofocus being at fault.
The reason is that focusing issues with a properly calibrated camera can usually be dealt with via the microfocus adjustment mechanism, but problems with the image sensor obviously can't be fixed by anyone other than Canon.
Do you still have the camera or have you already sent it in?
If you still have it, then put it on a tripod and try taking manually focused shots with your very sharp lenses when using live view with full magnification. If those shots are soft then it's your sensor. If they're not, then you'll need to use the microadjustment feature to dial in your lenses.
The 7D is more demanding in terms of autofocus than any other camera save the T2i. The reason is that its sensor pixels are smaller, so the precision with which the lens has to autofocus is greater.
If your sensor is good then I suspect that once you perform the proper microfocus adjustments, you'll find the 7D takes very good photographs indeed. Trust me when I tell you that the 7D can autofocus. It even makes my cranky Sigma 50 f/1.4 work reasonably reliably.