After taking a few night shots of our Christmas tree, I decided to remove My 24-105 and replace it with the 10-22. During this process, I made the mistake of laying 24-105 on our bar. Just as I was attaching the other lens to the camera (both hands fully occupied), Iwatched the 24-105 slowly rolling to the edge of the bar---You got it, it rolled off of the bar, fell52 inches on to ceramic tile floor which was supported by a concrete foundation. At that moment, you could have seen a grown man weep like a baby. Well, I gathered my thoughts and prepared for the worst. Upon initial inspection, the only visble issue was that the lens hood popped off. On closer inspection---nonoticeable damage. I reattached the lens to the camera and went through every test I could think of---everything worked--No cracked glass-AF worked, diaphragm worked, all electronics seemed to work, all switches and rings seemed to work---the test shots I took afterword looked great. No noticable damage of any kind that I could find.
Beyond great image quality,this is another reason we pay so much for L glass.
If Ifind any problems I will followup to this post.
One more note---always sit your lenses on the end---not on the side.
Bob