Seems I having a growing problem on my 5d with focusing issues. It is definitely not the lens as switched between cameras to check, any similar user issues or ideas where to get fixed? Nikon nutter need not return.
Nice one
Raymond from the forums posted this link a while ago, which may be of interest in this thread: http://www.canonrumors.com/tech-articles/this-lens-is-soft-and-other-myths/