At first sight the questions „What’s your favourite film?“ and „What is the greatest film of all times?“ seem identical. Thinking about it though they do actually differ quite a bit. I would for example say my favourite film is The Wrestler by Darren Aronofsky, but agree that Tokyo Story by Ozu Yasujiro is better. Favourites can change from year to year but great films withstand social changes, they are often symbolic for a decade or generation of filmmakers and viewers and certainly important to the evolution of the art of film. Basically everyone can have their own personal favourite, but great films require a certain unanimous vote.
Since 1952 Sight & Sound conducts a worldwide poll to create a listing of the greatest films ever made. Every ten years the renowned film journal canvases critics, scholars and directors, producers and actors to determine what is currently considered the greatest film. For the last 50 years Citizen Kane was at the top of this list. So it came as quite a surprise that Orson Welles directorial debut is no longer the number one.