I'm renting a Tokina 11-16mm 2.8 before buying any I must say this lens rocks! I'm not real thrilled with the manual/auto switch because I tend to bump I out of focus when disengaging the auto focus but over all I like it.
Anyhow, I have not used the newer version so I can't commit on quality. I do know the older units lacks a built in auto focus motor while the newer II models has an enteral auto focus motor. So if you like auto focus modes an your camera lack an internal focus motor, then you will want the newer model. Example, my D3100 doesn't have a built in focus motor, so I have manually focus it while using that camera. My D7100 o the other hand has a built in motor, so it can auto focus either one.