One of my buddies has the AF-S Nikkor 200mm f/2. He let me play with it a bit:
It is a very large, heavy lens, and it is also incredibly sharp. These are not studio portraits shot in front of a seamless. These are outdoor natural light portraits taken at our campsite. There are trees, bushes, and other foliage just a few meters behind the subjects in these shots, and as you can see, at f/2 everything melts into a smooth, creamy haze.
Beautiful lens, but not terribly practical, and at $6000 it's not a lens I'll be getting any time soon.