Filmmaker Karan Johar said he ranks 'My Name Is Khan' among Shah Rukh Khan's "career's best" performances along with 'Chak De! India', 'Swades' and 'Kabhi Haan Kabhi Naa'. "The volume of research he did on...Asperger's Syndrome, and the time he took off to get the speech and body language right...showed his dedication to the film and role," he told ETimes.