Having just purchased a 5d2 i can say it has a better initial quality out of the camera, and feels nice to hold compared to my 60d
I am aiming to ust the 5d2 for static/portrait shots and the 60d for motorosport and moving subjects because of it's crop and faster shutter speed.
The noise on higher iso is less on the 5d2 also.
Worth the money? Yes
Upgrade to the 60 D? Yes
Would i replace my 60d with it? No, horses for courses