Cinema Service:

Asian Star:

The CS DVD suffers from minor edge-enhancement that produces more grain (visible at the bottom of the frame).
Cinema Service:

Asian Star:

Cinema Service:

Asian Star:

The lower bitrate of the french DVD produces a slight drop in sharpness in dark scenes. I'd have to give the edge to the Korean disc for video quality.
Overall I prefer the french DVD for its flawless subtitles and its exclusive 38-minute interview with the director (in english, with burnt-in french subs).
All the extra features of the korean disc are also present on the french disc, with french subs.