Well, a quick summary of the video specs :
Nikon D90 :- Format : AVI (Motion-JPEG)
- Sizes :
- 1280x720 / 24 fps (16:9)
- 640x424 / 24 fps (3:2)
- 320x216 / 24 fps (3:2)
- Audio : 11 KHz / 16bit / mono
- Time limit :
- 5 mn for 720p
- 20 mn for others
- Autofocus : no
Canon 5D MkII :- Format : Quicktime MOV (H.264)
- Sizes :
- 1920x1080 / 30 fps (16:9)
- 640x480 / 30 fps (4:3)
- Audio : 44 KHz / 16bit / mono (embeded) or stereo (mic in)
- Time limit :
- 12 mn for 1080p
- 24 mn for 480p
- Autofocus : contrast detection
Plus other advantages of 5DII vs D90 (FF, shallow DOF, high ISOs)
As of 24p vs 30p, it's regarded as one of the specs which contributes to a filmic look (along with shallow DOF). Several threads talk about this subject on
DPReview message board.
You may have a look at
Chase Jarvis' video with the D90, and wait a few more days for
Vincent Laforet's movie with the 5D MkII.