Recently bought a Sigma 10-20f3.5 ultra-wide for DX. Together with my Sigma 30f1.4 this would give a light combination for walking trips in cities and also for landscape shots using the D7200. The 30f1.4 proves absolutely fantastic sharpness on DX but would need company for wide angles.

This one entry is purely focussing on the angle of view the zoom would give. I used the D2x  for a quick walk around Cuxhaven harbor area.

Two shots from each position, first one at 10mm and second one at 20mm.

10mm shot
An der Alten Liebe

The lens does have good sharpness on the D2x (will use the D7200 next time). Of course the distortions towards the corners are not unexpected and sharpness falls off but still reasonable.

An der Alten Liebe
An der Alten Liebe