I think a lot of folks confuse the results of the 70-200 f2.8 VR I with the 20TC and the 300 f2.8. In the former the lens is a different design, and the VRII does better at the long end with the 20TX. In the later with the 300 f2.8 the optics are exactly the same so there is no difference. I have many shots with the 300 f2.8 and TC's. More with the 14 and 17, because I just purchased the 20TC. I can shoot with the 14 wide open at f4, the 17 at f5.6 and the 20 at f7.1 or f8 and get excellent results.