28mm f/2.8 on DX
but Photozone's test suggested that it is poor on DX but quite good on FX (which I don't really understand).
Nikon D7000 do have more high pixel density (smaller pixels) than de FX Nikon D3x as test-camera. This could be the reason for the discrepancy in test results.
|Common Flashwing by digimania|
from canon dslr
|The Marilyn impersonator by Lee8282|
from Blowing in the Wind (Nature)