Whenever possible I read books in their original language.
I read mostly in English but I have a funny background and have no problem with French, Spanish, Portuguese and Italian. German is (sadly) a bit harder,
(So many great/untranslatable works in German....)
Language is an amazing thing. I have found that the same person speaking a different language seems to reveal a slightly different personality.
Each language is ultimately a just different platform (cage?) from which to contemplate reality, there isn't a 100% overlap, just the hope that we mean "quasi la stessa cosa."
@HarryT: I wish I could read Latin or Greek... My Latin only got my as far as "Commentarii de Bello Gallico".