This is not a strict comparison but Knicks coach David Fizdale - who seems like an interesting person by the way - has compared former Blue Devil RJ Barrett to Kawhi Leonard in one interesting way:
“This kid, there’s times he’s running by me and he’s not sweating. I’m like, ‘Are you going hard?’ But he is. He’s playing really hard. There’s only one other guy that I saw that I’ve coached against that just doesn’t look like he’s breaking a sweat. That was Kawhi. Kawhi doesn’t look like he’s breathing. And RJ kind of has that same knack where he’s out there and his face doesn’t change and he’s steadily going about his business.