MGS4 Comparison Japanese Vs. English
Channel: solongblake
Date: 2011-06-15

Outlining the differences found between the two versions (ENG/JAP). The story and script are IDENTICAL, also game-play, but there are a few notable differences. 
The theme of "SENSE" is predominant in the Japanese version of the game. Some of the voice inflections are different between the translations, sometimes for the obvious reason, other times it just ends up that way, and for the exception of Kojima-San going back and re-recording audio late in production for Sunny, with the help of the completed visuals.
Another notable difference is there are more voice tracks for when you pat down haven troopers in the Japanese version.