All very sound advice above, I think the best is to go to a proper camera dealer where they will let you really handle the camera and take a few shots. (Not a major high street conglomerate where you look at it bolted on a stand). A dedicated camera shop should let you do this (if you leave them a hostage like your child or wife

).
But seriously, a lot of it is about the feel of the camera, yes it will all feel a bit foreign, but a lot of it is about the ergonomics of the camera, how your fingers fall on the buttons, do to like the screen, how it feels held up to the eye. Little things like this. Forget about the quality of the photos it takes because they will both be excellent. Then it's down to gut feeling.
It's all about enjoying your purchase then.