No you're right. He's actually pretty bulky for a tallish guard. He can bang on the drive, but also show really nice feel for getting up funky shots; runners, floaters, leaners. Super high floor.
Not sure who the best comparison is...
Grant Hill comp. is off IMO, he is closer to Penny if we are going in that direction.
There is no one quite like him, it is a very ungrateful task to compare him.
The closest one IMO is Toni Kukoč while he was playing in Europe.
Toni didn't operate as much in the PNR (there was less PNR action back then) and was a lefty. When Toni was his age he was tearing Europe apart just like Luka does now, he was also a Point forward back then in Yugoplastika and Benetton.
During Chicago years, due to triangle offense and having MJ on the team, his time with the ball in his hands diminished greatly. People in the States mostly remember Toni from his bulkier Chicago days, where they've put additional 20/25 lbs on him, and that made him basically a big and not a guard/wing.
Toni didn't put people in jail like Luka does, but Toni was great at posting up.
I guess that is the difference between the eras they played in. Luka is a PNR maestro, Toni was a post up threat (it was easy to find a mismatch for him), both are unselfish, have flair and great passing vision. Luka is more feisty, Toni was more phlegmatic (Dalmatians usually are).
Some vids for a better understanding of what I'm writing about:
https://www.youtube.com/watch?v=eXoe6tHD5mE - in Yugoplastika, watch after 5:15 mark, nice dunk at 7:20
https://www.youtube.com/watch?v=2NKKnsbKRJQ - Toni (Bennetton) showing us floaters vs Real (Sabonis)
https://www.youtube.com/watch?v=V18tfKA57D0 - Benetton vs Estudiantes, playing more as a forward.