I've moved out of Pentax, but I've always felt that the handling of the K-5/K-3 series was exceptional; so much nicer than Nikon. Very logical. You can do everything important with one hand. The Green button! (It let's you come back to the camera's auto "optimal" with one click. Say your shooting manual, and make open up the aperture for a backlit shot, then move to another view. Hit the green, and you're exposure is back to neutral.
And I still love the MZ-S!