Speaking of comparisons, I've heard Sullinger say that he is inspired by the success of Kevin Love. It's too early to start comparing him to the likes of Kevin Love, but he's certainly a good model for how to be very successful in the league as a skilled, strong, below the rim big.
I think strength is sometimes a vastly underrated physical attribute in basketball players. Everyone gets wowed by length and leaping ability, but being able to use your body to push guys around can be a huge advantage in basketball. Like Love, I think Sullinger is not only very strong, but also has an underrated quickness and agility down low.