BKK2 on 09 February 2009
@ papflesje, it's really not a big deal if GfK's numbers don't match Sony's, they rarely release them (last time was October, PS3 was at 690k), and the few times that they do they only make a small article in a financial paper or Blu-Ray article. It's not as if it's big news that makes the mass media. Sony never quoted GfK, so there's really no problem if the two sources disagree. Anyway, the difference wouldn't be as much as 150k, more like 50k, so it's nothing to be concerned about.
