Fed likes some classical music as well, though I don't think opera. But he's had Beethoven and Chopin pieces on his i-pod. And last year he went with his mom to a Beethoven violin concert in Rotterdam for her b-day. OK, it was a b-day outing for her but doubt they would have gone if he hated that kinda stuff.
Anyway, that said, of course Djoko is more intellectual than Fed and Nadal - I thought that was common knowledge? That's obvious from his interviews, the types of movies he sees etc.
Nadal at least does read some books though; Fed isn't a book-reader at all and when he talks about movies it's usually James Bond kinda stuff. "Good Will Hunting" is about as "arty" as he goes to my knowledge anyway.