Speaking of similar scenes in the same movie: the sister reveal is explained 3 times! First Luke get the news, then he breaks the news to Leia, and then Leia has to explain it to Han. It makes sense for the characters to get this information, but for the audience it’s the exact same reveal repeated 3 times. And it’s boring.
I thought it worked. There its interesting to see each character’s reaction.
Also, Leia seemingly has no reaction to the fact that this implies Vader is also her father. (Luke tells her Vader is his father in the same scene.) Maybe her reaction is delayed or she doesn’t immediately make the connection. She’s upset a few minutes later after Luke leaves, when Han comes by. But it’s implied she’s upset mostly because Luke had to leave.
You’d think she’d have a much stronger reaction, like “Holy shit, you mean the evil cyborg that tortured me, and tortured Han, and stood by and watched as my whole planet exploded, etc. is my father??”
Nah I always figured part of the reason she didn’t want to talk to Han was partially of that realization. She was still processing all of that information and wanted some alone time.