Okay, it's not a film and it isn't light, but it we could be in this for awhile so a lengthy series is my suggestion.
It's been awhile since I watched it, but I really enjoyed the Romance of the Three Kingdoms series. If I had to describe it I would say that it is similar to Game Of Thrones, but better. Gorgeous production values, lashings of political intrigue, spectacular set pieces and unlike Game Of Thrones it has a good ending. From start to finish it runs a touch over 71 hours, split across 95 episodes.
The downside is that all of the dialogue is in Mandarin. However, I found that added to the thematic element and the subtitles are done well.
The whole series is available on Youtube
https://www.youtube.com/playlist?list=P ... 2dBvuDADJG
Watch out for Cao Cao, he is not a man to be crossed or swayed from his ambitions. If Cao Cao was a football manager I could see him masterminding Sheffield United. Their winged Phoenix formation is something that his tactical mind could have come up with ( I doubt Chris Wilder calls it that, but it fits ).