Mickey Rourke plays a street-fighter out to avenge a woman's death while Bruce Willis - who was not at the festival - plays a policeman who is jailed for a crime he did not commit.
Owen said: "Getting involved with this project was a huge deal for me. When I first saw the finished film I was completely blown away."
Rodriguez has said that work had already started on a sequel to Sin City, and would feature many of the same characters.
He added that the next film would be based on Miller's book, A Dame to Kill For.