Tom Cruise wears a Casio G-Shock MTG-910 digital watch in Mission: Impossible III (2006).
Tom Cruise uses a CWC Stopwatch in Mission Impossible - Fallout (2018).
Tom Cruise as Ethan Hunt wears a Casio DW290-1V in the first Mission: Impossible (1996).
Henry Cavill seems to be wearing a Suunto Spartan in the 2018 action film Mission: Impossible - Fallout.
Simon Pegg wears a Tissot T-Touch Expert Solar watch in Mission Impossible 5 - Rogue Nation.
In the movie Mission: Impossible II (2000), the lead character Ethan Hunt (played by Tom Cruise) wears a Casio G-Shock DW6900-1V.
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.