Aaron Kwok perfectly acted as the Monkey King. Out of all the actors who acted as Monkey King in other movies, no one else successfully portrayed the "Macho" and "Powerful" look at the same time human&monkey liked behavior like what Aaron Kwok did in this movie.
In previous episode, in my opinion, Donnie yen as the monkey king lack the "Macho" and "Powerful" look.
I mean, monkey king is considered the most powerful fighter in the novel. So at least he should have that "look / vibe" that when you look at him once, you know you wouldn't want to mess with this guy...