I just watched One Piece Movie 9 and I found quite perfect!
Chopper is one of my favourite Strawhat and a movie dedicated to Chopper's past is made me happy.
In anime, Drum Kingdom Arc was above average for me cause of its art and sound. That situation gives movie +10 points. Also including some new Strawhat to this arc (Franky, Robin) made movie excellent, I think. About other characters, all was the same. Luffy was still Luffy (and baka as always :>)
Vivi's absence was a bit sad but I didn't feel it too much while watching.
Story was really great and it's really worth watch it. Maybe there's not much comedy and laughing as there were in anime, even so it's really enjoying to watch.