I just got back from Oppenheimer (review will follow tomorrow) and I'm seeing Barbie on Sunday (review will follow on Monday). I decided to see them on different days.

One thing I can tell you is the cinema (Cineworld IMAX Plymouth) was absolutely heaving. Huge queues with tons of people seeing both films (our IMAX screening of Oppenheimer was sold out). There was a great up-for-it atmosphere unlike anything I've seen in cinemas since before the pandemic. So that's very encouraging. :)