Body-type and skill-set wise, I'd say he's a combination of Rondo and Harris.
I'd say Rondo and Harris are both better finishers around the basket at this point, Rondo is the best playmaker of the three, Harris is the most explosive athlete, and Hill posesses the best shot.
As far as defensively? I'd say they're pretty comparable, but I think Hill will probably be the best defender of the three. He has Harris' size and Rondo's long arms, but I think he's got a fearlessness and toughness that surpasses either player.
He compared himself a little to Ellis early on, but other than their somewhat similar size, and their comfort at the 2? That's really where the comparisons end for me.
Hill is a very good athlete, but Monta's explosivenss is freakish.
Hill is a tough-minded, gritty, defensive player, who posesses a good shot, and a willingness to pass the ball.(even if not a pure point)
Monta is a gunner, who posesses all the tools to be a complete player, but hasn't displayed the ability or willingness to be one. Toughness, grit, durability, and BBIQ, aren't the type of qualities you hear about when it comes to Ellis.