Sony, as of November 22, has now sold 30.2 million units of the PlayStation 4. By comparison, total sales of the Xbox One are somewhere between 15 and 18 million (Microsoft hasn't released an exact figure since last year).
With over 30 million units sold since it first went on sale in November 2013, the Sony press release declares that "PS4 [has the] fastest and strongest growth in PlayStation hardware history." The PS4 isn't the fastest selling console of all time, though: the Nintendo Wii, which sold around 45 million units in its first two years, still retains that accolade.
According to our own analysis that we carried out at the start of November, the PS4 continues to go from strength to strength. Xbox One sales seem to be improving and were buoyed last month by the release of Halo 5, but the PS4 continues to widen its lead over Microsoft's console. With Black Friday, Cyber Monday, and then the Christmas shopping periods approaching, Microsoft will no doubt be hoping to close that gap—but with both consoles at around the same price point (£250/$300/€300), and some strong games on both sides of the fence, we can't imagine that holiday season sales will differ much from the norm.
Even factoring in the Xbox One's improved sales in October, our analysis shows that the Xbox One wouldn't outsell the PS4 on an annual basis before 2024—and even then, there'd still be a total sales gap of around 50 million consoles. If Microsoft can't do something to narrow the ever-widening chasm, and assuming Sony doesn't do something completely crazy, there could be some difficult decisions to make: for Microsoft, for developers, and ultimately for consumers.