I have never had a pro series camera damaged by abuse. I don't think it's physically possible for a human being to damage one without a lever effect eg. falls with an attached long lens, or foreign matter in the mirror box.
The weakest physical point of high resolutions DSLR, whatever the make, is the alignement of the mount and sensor axis.
Any wall involving a shock on the lens, even a short/light lens, will most probably take the mount out of perfect alignement which will result on images with an unsharp area.
Even if it appears to be still working fine, any camera having sustained a fall must be sent for repair if perfect results are still expected.