Just found out the bad news..
5D MK2 is crippled just the like HV20/H30 in that the camera's movie mode is fully automatic. You can lock exposure and compensate exposure, just like the HV30.
This is a huge disappointment because the DOF range allowed on the 5DMK2 is a huge selling point of the camera.. The user loses huge flexibility by not being able to adjust the aperture independently..