By February 8th, Sony has sold 5.3 million PS4's to end consumers. Sony's sales numbers are about to jump another million or two, when it releases in Japan on the 22nd of February. Their internal goal was to sell 5 million units worldwide by the the end of March. Sony has surpassed the 5 million mark nearly two months early. It seems fairly certain that Sony will sell through more than 10 million units worldwide by the end of 2014.
With how pretty much every game runs better on PS4 than on Xbox One, it will likely also lead the competition in software attachment rates - where the real money is made. The Playstation division really hit a homerun with the PS4. By golly!