Ever since going full frame with the D800 I have not had an ultra wide lens for it (nor 35mm film). Have the Tokina 11-16 for DX bodies. But widest I went was 20mm in FX. So finally ordered a Nikon 14-24mm f/2.8. Thought about waiting on the Sigma 14mm but I thought as good as the Nikon 14-24 is, I would probably get more use out of the zoom than the extra stop and 1/3 from the Sigma.