We live in a 4K world, but Oldboy was shot on 35mm film with a gritty, desaturated palette. While 1080p is great, the encode hits the "sweet spot."
Oldboy is best experienced in its original Korean audio, but having a high-quality (HI) dubbed track or alternative audio (like English or a native language) is crucial for accessibility. oldboy 2003 720p bluray x264 dual audio hi best