Sales are important, but then it comes to profit the 360 is destroying the PS3 which brings us to who is in better position to win in sales by the end. I think its fascinating to watch how things are developing but its pretty clear to me that 2nd place will belong to MS. It also important to consider that MS isnt even trying. They only reacted after the PS3 announced price cuts which says a lot considering how loaded they are at the corporate level.
At this present time, MS could cut the 360 price in half and still break even on their hardware. Sony on the hand is desperate and will have very little wiggle room to react if MS decided to cut prices. The good news for Sony is that they still have complete dominance in Japan but it seems to me that they have lost the US and there is no chance of catching up this gen.