One of the few areas that CX could improve is the size of its F bathroom. It is nice to have two for 12 passengers, but it really is small and makes changing something akin to Chris Farely's changing routine in Tommy Boy. While it would be inconvenient for just beofre landing, it would be nice to loose one of the bathrooms and replace it with a larger one.
FWIW, AA has a very large bathroom between F and J on its 777s, which is handicap accessible, but is also great for changing.