Are there more than TWO Allied companies because a quick check on the internet shows that Allied Feather and Down is a Chinese company. Are you saying that FF and WM both use Chinese down? I always thought that European down was the only down that gave fill power 750+ and beyond. From everything that I read, European down is superior (lofts higher, more durable etc) as they rear the geese till they're older (so bigger plumes).
If North Face, Integral Designs, MH, Mountainsmith, Moonstone and Marmot (Polish and Hungarian) all use European down, it would strike me as rather odd that FF and WM (both synonymous with quality) use a supposedly inferior down.