I read reviews comparing the Infernal Affairs trilogy to the Godfather trilogy. After I watched the first film I thought this comparison was silly, because it didn't have anything in common with "The Godfather". The second film, however, is closer to the Godfather films, since it shows more of the power struggles and internal politics of crime families.
While watching the first film I was confused by Buddhist undertones that seemed to have nothing to do with the film itself. In the second film Buddhism plays an even stronger role, in words at least. I still don't understand the relevance. Maybe one of my readers can explain it to me.