This is just eye test, but Wilbekin and McClinton seem to be about the same. Haven't seen much improvement over the course of their careers.
Collins - unbelievable, dramatic improvement. He showed flashes last year but didn't get enough run for his abilities to really be out on display. Even still, I don't think anybody predicted this meteoric rise
Crawford - very improved. As has been noted, he appears to play more within himself and lets the game come to him. Don't think we've seen his ceiling yet though
Moore - improved. Still needs to figure out his role when he's on the floor. And somebody needs to just tell him that he's over 7' tall. Like Crawford, don't think we've seen his ceiling yet. IMO he has all the physical tools to be as impactful when he's in the game as Collins has been this year. There was one game last year, can't remember which, where he had a couple sequences that were like defensive reb - dunk - block - dunk. Or something like that. It was like a minute long flash of what Moore could be.
Dinos - I would say he's improved, but that's probably subjective and depends on your perspective more than anything. He doesn't appear to shoot as many 3's as last year but his added bulk gives him a new post game facet to what he brings to the game.
Arians, Woods, SJM, Mitchell, and Washington are all new. Which is pretty crazy to think about now that I've typed that. Again, all that is just eye-test