Emma Watson
She is the master of the British accent! Wait a second, she IS British. Let’s try that again with “The Perks of Being a Wallflower” and “Regression” where Watson played an American in both. There is no doubt that she is one of the greatest products of film school of our day.
Christoph Waltz
The infamous SS-Standartenführer Hans Landa from “Inglorious Basterds” does indeed speak more than one language. In the World War II film he spoke in English, German, French and Italian. Not only did he speak perfectly, but he also mastered the accents for each one. When the movie was dubbed, he did the voice-over for his own character for the German and French versions.