Well, im now the owner of a 40d with a sigma 105 lens, and after the simplicity of the fuji it's quite a technical leap !
having been a "stick it on auto, point it and press the button" user, its going to take quite some getting used to, so far just had a play around with it on full auto and even at that setting its quite a steep learning curve,

still, give it a couple of years and lots of practice, and i may get the hang of it