Offensively, Harden might be the closest comparison for Luka. But Luka is better, he is more versatile, more multiple. Harden was dribble, dribble, dribble, step back or pump fake and take it all the way to the rim for a lay-up or lob/drop off. Luka can do that but also kill you in the midrange, back you down, fade-away. It's Harden plus like Carmelo midrange and in the midpost. Maybe he'll miss his shots. But there really isn't a defense he can't counter with his skill set.
In the past, you could say he dominated the ball too much, like Harden would. Now, he willingly gives it up when doubled, especially bc he trusts PJ and now DJJ hitting shots. It's not just sharing it with Kyrie. And his game is better for it. He can pick and choose when to be aggressive and wait for the fourth quarter to really dominate the action.