Franky is... something. I'm most definitely not a fan of his arms, I'll tell you that. They seem very much so overdone, but maybe it'll grow on me.
I was particularly interested in Nami, truthfully. She's noticeably matured which has definitely caught my eye, as the changes are somewhat subtle but still manage to present that "Still Nami, just older" feeling without coercion.
Not too interested in Usopp. Granted, I wasn't really interested in him to begin with, and his new change makes me think somewhat better of him, but he's still not on my list.
Chopper. Same as Usopp without the improvement. Wouldn't mind being pleasantly surprised by him, though.
Robin. I've actually lost interest in her now. Unlike Chopper, though, I fully expect her to prove me wrong.
Zoro. Good job. I'm liking the new you.
Those are the only ones I feel like mentioning.
Luffy, however, seems to have changed the most, in an almost scary way. Whereas before he was full of youthful vitality, now it seems more as though he has the fire of ambition tempered through maturity. I fully expected him to go all-out, so when he pulls something like this, it's quite... surprising. Not in a good or bad sense, just... surprising.