November marked the first month since December 2013 that saw Xbox One top PlayStation 4 in the US sales department.
Microsoft's console was #1 in the UK as well and now, Sony has commented on the shift. In speaking to Reuters , SCE president and CEO Andrew House said sales conditions in November were indeed "tougher" due to Microsoft's aggressive pricing actions.
As you probably know, the Xbox One now starts at $350 (PS4's lowest price is still $400) and MS also offered some holiday bundles for $350. However, that Xbox One markdown is only good through January 3, 2015, so it'll be interesting to see what happens when the price goes back to the standard $400. As for PS4 sales in December, House says they're "in line" with previous estimates but he didn't provide any exact numbers.
However, he did say that increased demand for the system in Europe has resulted in limited inventory. You should be able to find a PS4 if you look hard enough, though.