Although it seems the PAL has more detail i believe this is only due to the fact that it's PAL (which has 100 more lines of detail over NTSC) The NTSC from the HD seems to be less defined but I’m putting this down to the fact that it's NTSC, on the plus side the images is smoother and doesn't suffer from the grain that the PAL disc has.
On the subject of colour i would have to say I’m a bit confused. In some scenes I would say NTSC is more vibrant and natural but in others it seems to have a distracting green tint. I have no idea if this is the colour balance that the director originally intended. We could argue that until the cows come home.
CONCULSION
The HD is an excellent transfer, if only he did it as an PAL then it would kick the offical PAL discs ass