Am torn, dunno which ultra wide angle suits me better ? btw, am using APS-C cameras, Nikon has the best range but slower lens, Tokina 12-24 is 2mm narrower (10 degrees different), has good range and speed (just one f/stop away from the fastest brother lens), really hard time deciding which to choose, wonder what are the considerations to get a UWA, appreciate any help ... thanks.
Nikon AF-S 10-24mm F3.5-4.5G DX
Tokina AT-X 116 PRO DX AF 11-16mm f/2.8
Tokina AT-X 124 PRO DX II AF 12-24mm f/4
Sigma 10-20mm F4-5.6 EX DC HSM
Sigma 10-20mm F3.5 EX DC HSM