Will:

DPL II can vary from DD 5.1 in it's resolution on a DVD.. The DPL could actually be a straight PCM 48k print of the soundtrack on the DVD (they might not have made the film in 5.1 in the first place, for example), which could sound better. There are many, many variables on how they can do it, and unless one has intimate knowledge of how exactly something was done, it is all speculation, and direct comparasons come down to individual preferences.