This movie depicts a kind-of dystopia where society is separated by individual performance much more than today, but still it somehow doesn't feel so much different than todays reality.
Because it only depicts a few days in total but partly from 3-4 different perspectives, always adding a little background to the story, it has it lengths. It also is a bit pretentious, as another reviewer put it in a nutshell. But I like the reminder - or maybe "warning" - that the story shows us.
The reason, why it doesn't get just 5-6 stars from me but 7-8 stars, are the overall impression (the plot unfolds quite beautifully) as well as the en passant insight about the importance of certain small key actions and key figures and their development. I don't want to spoiler but in the end I really considered two different people as protagonists than throughout most of the film.