Tbh, I really like how Toei portrays Luffy's awakening as a crazy laughing maniac in front of his opponents.
In Luffy's eyes, he's just having fun, playing around. In our eyes, he's ridiculously goofy like a Looney Tunes character.
But in the eyes of his opponents:
Red menacing eyes with a crazy laugher.
It definitely gives some great tension which lacks in the manga but that's the question: Why does Oda not draw panels like these? I think it'd be enough if we just got some few panels how G5 looks in the opponent's pov.