That would be interesting to see. The above images were shot at 500mm and f8. One thing to consider though is neither Canon or Nikon make a lens in this range. For Canon they make a 100-400mm and 1.4x tele-converter. Nikon makes a 200-400mm and a 1.4x tele-converter. You won't be using IR or VR because you are on a tripod. For the Canon you are looking $2000, the Nikon $7,000-$8,000. Now granted there might be situations where the VR will come in handy and that makes a difference possibly. The Tamron is substantially less. I shot these with the D-700 and have blown the horse image up to 30-40inches in a print. I am very pleased with the sharpness.
I would still love to see the side by side test though.
