Had a fun first weekend with my D800E. Most of the Golden Eagles were a little too distant and up-light to be great photo ops, but we saw 227 of them with exceeded my life total by a factor of 10!
This is TC17E and 500VR and D800E at ISO 3200 and 2500 respectively on juvenile Golden Eagle and Clark's Nutcracker.
The one thing I found is initial AF lock with the TC17 was a bit on the slow slide, so with regards to this thread, AF performance should be considered/taken in to account. Sharpness was fine though (even though I haven't AF fine-tuned yet).