“When you look in the mirror in the morning, who looks back at you? Clark Joseph Kent, son of Jonathan and Martha Kent, or Kal, son of Jor and Lara of the house of El? When they find your dead body, who do you want them to identify you as?”
That´s it! I think Kal-El never really thought about that. In the movies I always had the feeling that he doesn´t see himself as a real person in his Clark Kent persona. But why? He was raised as Clark Kent and was nearly of age when he got the information about his origin. Even the comics have changed this approach to Clark Kent and made him a real person, but in the movies it´s still the same problem.
As far as I remember, all of the Superman movies end with a "smile for the camera" moment. (STM, SII and SR all do--I'll have to watch SIII and SIV again to see if they do or not.)
I never saw S IV, but I can tell you S III does
