Just stumbled upon this new lens from Canon this morning. Trying to work out the reasoning behind it though. It's an L lens, but surely it isn't meant for a full-frame body like a 5D? If it were, then pretty much all of your zoom range would be between a whole circular picture in the centre of the frame, to varying crops of a circle (8mm fisheye on a full frame body is a total 'fisheye' circle). I think this is possibly designed more for APS-C bodies (even though it is an EF mount so will work either way)
Thoughts?