I haven't used the Nikkor, but the Tokina is the lens that is mounted on my D300 more than any other. There is a little amount of distortion on the wide side, but it's a quick fix in PS. Other than that, it's top-notch in my book. However, if you ever foresee going to FX, I would seriously consider forking over the extra $1k and getting the 14-24. Sure, it's a lot more money, but in the end, it would save you money. The only thing I don't like about that lens is the inability to screw on my Singh-Ray Vari-N-Duo.