So....................
How's he gonna do against Rosberg? Does Rosberg get as much out of the car as it's capable of and can Hamilton match that or find something more?
How long does it take for a driver to get the feel for the car of a new team?
It's not often I like to make predictions, as they can have a habit of being rubbed in your face. But I'm pretty confident that Lewis will outdrive Rosberg. Don't get me wrong, Rosberg will put up a good fight and win a fair few battles especially at the beginning of the season, but come the end of the year Lewis will come out on top.
My guess is that the results will be similar to what we've seen with Button. But don't stop there, why not go out on a real limb and predict that at more than one race next year Lewis driving a Mercedes will come out ahead of both Mclaren cars. That's a hair on your chest prediction.
Hamilton and Rosberg are good friends, so friendly competition is good. I don't think Rosberg will feel the need to prove anything, as the Mentality at Mercedes next year will surely be improve the WCC results at all costs.