I just bought THE dream video lens for the 5D II.
It's the 50-300/4.5 ED AIS from Nikon. If it is as good as it's reputation - look out high definition landscape videography. I am carefully expanding my collection of exceptional manual focus glass since that gets around the problem of not being able to choose the aperture when filming with the 5DII.
The video AF of the 5D is useless since it is not continuous - you have to press the "AF now" button to engage it. Smooth manual focus should take care of it.
Still waiting for my acceptance to IS videographer.