Well I think you did a decent job with it. I think if there was just a better way to ease the blur in it would help the eye agree with it better.
The wind was blowing crazy, so I think that was the issue. But the whole thing got me thinking, and yesterday I went out to create something as realistic as possible, but still fake.
I have a friend that owns my dream lens, the 300/2. He also owns a 200/2, and did some focus tests for me the other day, and I applied them yesterday.
This is what a shot from a 500/2 would look like, if the lens existed (and it would weigh approximately 60 lbs, and be somewhere in the neighborhood of a million dollars).
In all honesty, it's not that much different from the 200/2. It would really all depend on the location.