This seems a unique lens (first f2 zoom for FF after the f1.8 zoom that Sigma made for crop), which lens(es) did you sell when buying this one and satisfied ?
I think we can consider this ona alos as a speciality lens, not much casual photographer would buy it, most would go for 24-70 2.8 or 24-105's f4 for the bigger range.
Or do you find the range less interesting and rather have the Sigma 35 1.4 Art ?