Hello gstadter, and welcome to the friendly Camera Labs forum!
To enjoy your stay here please have a look at the house-rules
As to your question: I have not scheduled the shootout, so for the time being you need to look up the individual results and compare them by yourself. For easier reference I've listed the links:
- Nikon AF-S 70-200/4.0G ED VR
- Sigma AF 70-200/2.8 EX DG OS HSM
- Nikon AF-S 70-200/2.8G VR II
- Tamron SP 70-200/2.8 VC
I know that is not ideal, but hope that helps.
Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews
, My Pictures
, My Photography Blog