Citizen Kane is a film with epic characteristics, and was at least 30 years ahead of his time, let's start by spectacular Gregg Toland photography, which for me is one of the top 5 best film photography, all the camera angles, metaphors, editing, close-ups, the use of natural and artificial light, mounts scenarios are something inexplicable (Remember Kane's speech), J. Mankiewicz script is great, using flashbacks (something new in time) and the timeline in your favor, I really can not say if this film was the first film to use these narrative resources, I think not, but it sure was one of the first to use a magnificent way, the soundtrack it is accurate, and the performances are very good, especially the Orson Welles doing a magnificent job, as director and actor, worth a reference scenes "Post credit" which explains that all the actors are new, cool also speak the name the cinematographer Gregg Toland is credited alongside Orson, Citizen Kane marked the history of cinema as we know it, so you go to see the movie today will notice that most of the "things" are very common nowadays and did not understand why the film is so prestigious, but remember that citizen kane invented this pile of "things."