I like Zoro and all but you have to be delusional to say that he has the best choreography in One Piece. Oda is bad at sword fights.
On topic, his powerup isn't super visually impressive in the manga, but neither is Sanji's. Reserving my judgement until I see them both animated. Its not like anyone was expecting some kind of full body transformation for Zoro in the first place, though. Of course whatever kind of PU he got would only affect his swords