I am a 20D user and my images are super sharp. When I first recieved the camera I found myself doing selective unsharp mask, until I set the shooting parameters to max sharpness. Other than that no vibration problems. I also follow the lens Inverse Rule shutterspeed >60mm for hand held shots and match shutterspeed to lens max length (1/100 = 100mm Lens). Perhaps you friends camera has a defect or malfunction. I have 6 other friends with 20D and they also reported no such problems.
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