This looks fabulous! I bought such a lens for my big Nikon, and perhaps I ought to get it out and have some fun like this... At the time I was buying it for low light situations, but I think DOF is even more fun!
@Weezilou my macro lens which goes down to F 2.8 is fabulous for this kind of shot! I love to throw the background out of focus or pick up a spot right in the centre of the image. You can be creative with this kind of lens!