The British actor plays Marvel supervillain Mandarin, widely described as Iron Man's archenemy, in Shane Black's upcoming third instalment.
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"On his last take of his first full day as the Mandarin, when they yelled, 'Cut!', the entire crew burst into applause, spearheaded by Mr Downey himself," Feige told USA Today. "It was pretty amazing to see that."
Feige, who has served as a producer on every Marvel film production since 2000's X-Men, previously confirmed that Kingsley's Mandarin incorporates several ethnicities.
Iron Man 3 will be released in the UK on April 26, 2013, a week before its US debut on May 3.
Watch the teaser trailer below:
