Tokina 11-16 Best sharpness, best speed, poor flare, getting replaced later on in the year with a mkII
Tokina 12-24 not the best..
Sigma 10-20 OK slow, f3.5 not as good but faster
Sigma 8-16 (looking like a favourite so far) - super sharp ( 70-200mkII sharp) but bulbous front end prevents (easy) use of filters
Canon 10-20 - best all rounder IMO