The v1, at least, wasn't great for action. It has 10 focal planes, but they cover a fairly small range of distances, so it still needed an autofocus to get the range of focal lengths to be centered on the subject. And that autofocus was pretty slow, even slower than what I'm used to on an SLR.

I'd assume the Illum (which I've never had a chance to play with) would be way better on that front.