Yeah you're right. Not sure why I wrote that, I think I was momentarily being dumb. I do think that primes are typically significantly sharper, but I can't really speak for the Tokina 11-16 one way or another.
Thanks for the response, mate.
I haven't used the Tokina 11-16 for more than a few minutes, but as a general rule, I try to stray away from wide zoom lenses for cinema. The zoom functionality will hardly add anything to your shot composition, and the likelihood is it'll make your image less sharp.
This topic has always confused me. On a technical level, how is the "native ISO" determined?