Maybe it's the blown-out whites and the more-saturated reds that Canon tends to produce that you like? I mean, at least more than you like Nikon's more-detailed whites, lower red saturation, and enhaced green saturation? I dunno.Canon does have a "look" that a lot of internet-era people really do like. Are you shooting JPEGs, or working with some very basic, default image adjustment profiles? Either way, D600 or 5D-III at twice the price of a D600, you should be able to get some decent portraits on a consistent basis once you get "dialed in" well.