Microsoft sold 170k in a week? Damn UK is going to be a battlefield for Sony and Microsoft, a 80,000 difference isn't too bad. Microsoft is going to have to go in HARD to try and win the UK again.
150k in its first week, 20k in its second.
I think that history should show that launch week figures are not an accurate barometer of long term success. Let's look how they're both selling in the new year, once supply is not constrained.