I would be interested in knowing how this lens performs in lower light situations.....ie does the IS allow a slow enough shutter speed to shoot indoors, not so well lit situation.
I have been debating this or the F2.8 version for some time.....lots of dollars between the two.
Congrats on the new lens...cant imagine you wont be happy with an L series anything.
Freedbaby
IS is virtually useless for sports photography. IS compensates for you hand shake allowing for slower hand held shutter speeds. It will not freeze motion. That requires high shutter speeds in the area of 1/250.