Mumbai: Actor Ranveer Singh says his industry colleague Irrfan Khan is a "once-in-a-lifetime artist" who has come up with the performance of a lifetime in his upcoming film "Madaari". "This is a very significant film for Hindi cinema, a wonderful film. Performance of a lifetime from a once-in-a-lifetime artist, Irrfan sahab. This film just stirred me up from inside," Ranveer said at a screening of the film. "Irrfan sahab is world renowned as one of the greatest actors, the less said about him the better, his performance speaks. As an actor, one can understand what it takes, what the ask is and how much it might take out of a person to put up a performance like this." He also appreciated the tagline of the film, "Desh so raha hai" as "appropriate" and "well thought of". "Nishikant Kamat is a very significant director and he has proved it once again. He started off with 'Mumbai Meri Jaan', he is a Mumbai boy so I'm very proud of him. I know him for a few years and he has made an amazing movie. Really incredible work by Nishi sir, Irrfan sir and the entire team." Ranveer was accompanied by his rumoured girlfriend, actress Deepika Padukone, who said: "We are just recovering from it; It's outstanding, I don't even know what to say. I think it's one of those films that's going to stay with us for a very long time and it's going to get all of us thinking. It's going to stir you up emotionally." At the event, Ranveer was also asked about his rumoured engagement with Deepika, but he asked Deepika to leave, escorted her till her car and then said: "At least respect the kind of film that we watched, don't talk about such irrelevant matters." He also refused to comment on superstar Salman Khan's criticism of him dancing in a Paris theatre while watching "Sultan". "Let's talk about 'Madaari', it is the screening today so it'd be better if we talk about it," he said and refused to answer another question after that. "Madaari" released on Friday.