Unfortunately, I didn't see it (at least not yet), so all I have to go on is the opinion of those who did. Based on that, it sounds to me like little has changed in Mahinmi's game. He's now 22 (going on 23) and was drafted 4 years ago. I know he missed virtually all of last season, but he should be further along than he is.
For example, from summer league until now, all I've seen or heard with regards to Hill is how he "looks like a different player". Everyone can see it. While he had his moments in summer league, I don't recall anyone saying the same for Mahinmi.