During the accident last Saturday. I saw it with my own eyes... what my whole setup have been thru - a rather big branch took a direct hit on the middle of 70-200 IS L lens barrel, the impact was so strong that it the whole setup (70-200 IS L + 1.4x II + EOS D60 + 550EX flash on an Acratech Ultimate Ballhead) got toppled to it sides and one of the Gitzo CF tripod legs was kinda shorten/dampen because of the strong impact, it was not totally toppled only because of the dense branches.
And only some rather ugly scractches on the lens hood and two minor paint chip near the focus rubber ring.
The lens including the IS functions is still ok, tested systematically (about 100+ frames) after the accident.