Shabazz by a mile,then everyone else. The guy has "high scoring" written all over him. If he had the quicks to play SG he'd be a can't miss all star material. At SF he's undersized and saved by his long arms, but compared to Melo, Lebron, and Durant he's undersized at the suddenly massive wing position. As it stands he's big enough and he has all the fundamental skills (handles, shooting, creating, etc).
Someone might grab a big on potential over him, Durant and Jordan couldn't even avoid that, but IMO he looks like the best player so far.