Here is a video from the D23 Expo featuring Robert Downey, Jr. and Chris Hemsworth talking about The Avengers. Earlier we shared a description of the panel, where Kevin Feige showed some footage from the film. RDJ and Hemsworth talked a bit about the difference between being the title character in a film, and working in an ensemble cast.

THR then asked who would win in a fight: Iron Man or Thor? RDJ finally responded by sayying that Tony Stark might be beaten by Thor. “Look at him – he’s a deity,” said Downey of Hemsworth. “I’m just a fella’.”
Awesome Njoy