I just posted a photo of red dog in the dogs thread; it was shot with the 14mm Sigma. It's a decent demonstration of why I like a SWA lens. Probably shot from a distance of only 6-8 inches.
I don't think you can really compare two different lenses by the same manufacturer; these things are designed and built at different times (markets) to different price points and specifications. Anyway, the Tokina is an f/2.8, so it's faster than the 16-35. Take a look at dxomark to compare it to the Nikkor. As I said, the image quality is miles better than the Sigma, and it's, what, half as expensive as the Nikon?
Let me know what you think.
