The animation in Part II is much improved, similarly to how Eternal films behaved.
The final 15 minutes are really beautiful and well done, incredible use of colours and composition, the atmosphere is good, deep insight into characters. It was fantastic to see Galaxia and we got time to spend with her (unlike any of the other villains in Crystal) and understand her background and motivation a bit, which really helped with the world building and storytelling.
In the last 10-15 minutes the pacing also finally slows down, and we get to see the most beautiful animation of Sailor Cosmos (thanks largely in part due to Sidney Deng's contribution to some key frames as well as the transformation for Chibi-Chibi).