With my old 100-400mm IS lens I noticed a lot of out of focus shots but then when I got my 300 f/2.8 IS mkII, I realised it had to be a camera issue. It was only getting maybe one in three shots in focus in great light without any movement.
It is costing around the £200 mark to get this repaired and I have never dropped the camera, it has probably had some small knocks but nothing to cause such a severe failure. I know there is a lot of people out their who get frustrated with their 7Ds and I am now among you. In the mean time going back to a 400d is hilarious especially attaching it to a 300mm f/2.8.
I shall be posting some recent shots taken of a Bullfinch with this configuration, better than I expected if I am honest.
If anyone else has trouble with the 7D's focusing, please do get in touch with me.
I thought I would share one of the camera's better images, taken with my 17-40mm lens in India.