There is no 'original' 5.1 mix of TGCD. It was in fact a quad mix, incorrectly labeled a 5.1. Bruce did a better job with the rears, I agree, although Jens is a master of great guitar and drum sounds for heavy releases.I thought the original 5.1 mix of Katatonia's The Great Cold Distance was inferior to the stereo.
But, Bruce Soord's re-remix for the 10th Anniversary edition does it for me. Plus the bonus concert has a symphony discrete in the surrounds. Great DVD-A.