I was Dx follower for long time, until I got a great deal for D3s and You know what: it gives You a lot of new possibilities, even when You shoot animals, like I do. It makes You to think twice about composition. On dx it was easy - just fill the frame with animal, while it worked for some shots I'm starting to see the beauty of showing not only the animal itself but also the habitat the animal lives in.
Below are two examples of fx vs dx.
Fox

on dx I'll more likely go for picture similar to the one below:

Lion

while on dx I'll go more likely for this kind of shot

both taken on d3s, the first on in fx mode the second one in dx mode





