Yip, would be inetersted to know if you considered any of these and why you ended up with the 35.
I had the 28 and 24... got rid of them and stayed with the 35...
Reasons being:
The 24 feels like a toy, and I'm not too impressed with the optics.
The 28 is ok, but focal length is nothing that I need. I have the 28-70 now to cover this range and speed. No need for it anymore.
The 35 is really nice for its focal length. It takes you back to the ~50mm crop view of those film ages. F/2 is nice, but leaves you craving for more speed. Sharpness is great from f/2.8 onwards, but if you plan to shoot it at F/2 all times, it might produce little bit of softness, but not to worry about if you PP sharpen your images.
Its a nice little lens and it have overtaken my 50/1.8 and 50/1.4 places, just because its fun to use! Lightweight, compact and "just right" field of view on a digital sensor. It can also focus very close (0.25m). I can get close up and even blow the background out with a relatively small aperture (f/4 or f/5.6) and image remains relatively undistorted.
Only thing I want it to be is having f/1.4. But if you really require the speed, go with the Sigma. Tho it will only work for DX sensors. Won't work on film or a D3...
I can take some sample shots for u with this lens if you want to...
ps. if you need something wider, then the 20mm is your choice. But I think it is bit more expensive.