Wong Kar-wai is both famous and infamous as an auteur, who dislikes writing out scripts and storyboards and relies much more on improvisation from the actors, and it really shows in this film. The first half of the film is basically Donnie Yen's Ip Man 1 & 2 crammed together in that it tries to tell a biopic of Ip Man's life with massive liberties taken. The second half of the film basically becomes a different movie as it's all about the female lead "Gong Er" who to the best of my knowledge is fictional and who is trying to take back her family martial art from the evil Ma San who killed her father - someone who Ip Man doesn't even have a conversation with let alone fight.
Speaking of the fights, there's a lot of random ones in this film. Like the "Razor", the barber dude who shows up once to have a brief scuttle with Ip Man, he gets his own titlecard and we go into his backstory but after his one scene is done we never see or reference him again in the film. The fights themselves are decent, though very heavy on slowmo' and DRAMATIC ZOOM INS to show the power of punches.
The main plot thread that really links the acts is the forbidden love between Ip Man and Gong Er, since everything else is largely unconnected scenes. Tragic love seems to be Director Wong's passion but I wasn't really feeling it in this film, it's not that the actors didn't have chemistry, but the writing between them didn't feel natural. In fact the greatest flaw of this movie seems to be that it's stuck between being a biopic and a love story and can't decide on which and so suffers for it.