Sony announced today in a press release that the PS4 has reached a brand-new sales milestone. The PS4 computer entertainment system has sold through more than 20.2 million units as of March 1. This makes the PS4 the fastest-selling piece of PlayStation hardware in history. This hardware generation has been an exciting one so far, and seeing a console already reach 20 million people without a major price drop is impressive. It's even more amazing when you consider how the global economy is still in a recession -- so a big-ticket purchase is far more important now than it was even when the PlayStation 3 launched in 2006.