I read the book before watching, my wife didn’t. She didn’t get the ‘connectedness’ of the characters and so didn’t really like it as much as I did.
I liked the book but in the movies all the actors playing different roles can be a bit jarring, especially when halfway through their story you realise that a female character is a famous male actor etc., and you get taken out of the movie suddenly. That said, the credits are great because it shows who played who, and some of them you’d never guess.