This week has undoubtly been a great week for Sony. They dominated the news firmly without leaving much breathing space, if any, to the competition, and managed, at least temporarily, to raise the popularity of their console quite a lot.
Of course we don't have much data yet, besides what's provided by the retailers, and even the data we have doesn't give us any hint on what the long-term results will be.
What we can do is to observe the present, and wonder what the future will hold.
One of the few early sources of data we have are the Amazon popularity charts, that list the popularity of each item compared to other items of the same category (updated hourly).