The Tok' 11-16mm f/2.8 was one of the few lenses I kept when I sold a lot of DX kit/moved to FX. The only drawback is there is some distortion to deal with, but it's easily corrected in Lr or Ps. Besides, you're not going to be able to shoot at 11mm on a DX body and NOT have some distortion to deal with using any lens I'm aware of. Purple and green chromatic aberration, particularly purple in my experience, can also be pretty intense but that's also easily removed in Ps. In fact it was images I got with this particular lens that spurred me on to learn how to deal with CA.