I don't have S3 so far, but got the BOBW-Movie-BD today.
To my taste, the music on the 7.1 english track is MUCH
too loud compared to the voices.
If I reduce the volume to a normal level while the opening theme is on, I almost can't hear the voices later on.
I just watch on the TV, I don't have surround audio equipment here at the moment.
S1 and 2 sound appears normal on TV with the same settings.