Image quality is excellent, and this is already well known. You will find many other reviews on the Internet about this camera in details. One thing that less frequently mentioned is possibly the exterior design of this camera body. I think 5D2 is the best-looking camera among those cameras of the similar grade, such as D700 and A850. The proportion and the curves are very well designed. My view can be rather subjective, however.
The CF card door is flimsy. When you hold the camera in your hand the closed CF card door makes a little squeaky noise. Canon shouldn't ignore that as this small issue brings a not-so-good an impression about its quality control.
There have been quite many upgrades on the camera firmware. Continuous upgrading is a good after-sale service. This also tells us that Canon highly values 5D2 as their important strategic product.
I am wondering if Canon can also upgrade the CF card door as a hardware bug fix?