Pine did quite the Shatnerian swagger at the end of the first film, and the way he sat in the Captain's chair with his legs crossed was very reminiscent of the Shat. All-in-all, Pine did a fine job of invoking the feel of Kirk without crossing into imitation.
Urban, on the other hand, is clearly doing an homage to DeForest Kelley's McCoy, right on down to the eyebrow arch. That's fine with me, because the imitation is really good and I have a seriously soft spot in my heart for De Kelley's portrayal. He's still my favorite part of TOS.