I just bought a nice 5D Mk II with about 19K. It feels very similar to my 7D, but here are some immediate observations I noticed as soon as I picked it up in my hands:
- Nicer viewfinder
- Different sounding shutter
- Visible vignetting in viewfinder with all my lenses
- "Old School" On/Off switch
Things I like more:
- Slightly better Image Quality
- 1 stop better High ISO performance
Things I didn't realize would bug me:
- Battery door feels cheap
- CF door feels cheap
- No M-Fn button for AF Zone selection and other things
- Rear LCD has slight purple cast
- Liveview/Movie Mode button and menu is not as good as 7D
- Exposure comensation only + - 2 stops
- Flash Exposure Compensation only + - 2 stops
- No FEC in Liveview
All in all I am enjoying the camera, but don't think I will sell my 7D as I had planned.