Read Don Quixote 5 years ago, never laughed so hard reading a book.
It was a new translation (read it in french) and after a quick comparison with other translation, it makes a HUGE difference, Don Quixote was originally a popular, down-to-earth book and some translator failed to adapt that turning old popular/simple (at the time) spanish into pompous french with never ending sentences and overcomplex syntax.
I don't know the situation for english translations though
