In the Mission Impossible 4, Tom Cruise wears a Tudor Heritage Chrono watch.
It looks like Simon Pegg, in the movie Mission: Impossible 4: Ghost Protocol, wears a large Casio G-Shock GX-56-1B.
In the movie Mission: Impossible - Ghost Protocol, actor Jeremy Renner (best know for his part in The Hurt Locker) wears a Rolex Submariner Date.