The PlayStation 4 sold 322,083 systems during its opening weekend in Japan, easily surpassing its predecessor the PlayStation 3, which moved only 88,443 units during the same window in 2006. The PS4's worldwide sales tally before the Japanese launch was 5.3 million units.
The numbers come from Japanese gaming publication Famitsu (translated by Siliconera), which notes that the PS4's launch in Japan closely resembled the Wii U, which sold 308,570 units during its launch weekend in Japan in 2012. Importantly, today's data does not come directly from Sony, so we'll have to wait for official confirmation.
The PS4 could not match the record-breaking PlayStation 2, however. That system sold an astonishing 630,552 units--nearly double the PS4-- during its first two days on sale in Japan in 2000. The PS2 has since been discontinued, though that doesn't mean publishers have stopped supporting the system. In fact, EA Sports shipped a version of FIFA 14 for the PS2 just last year.
To celebrate the release of the PS4 in Japan, Sony held a midnight launch event featuring speakers like SCE CEO Andrew House and Metal Gear Solid creator Hideo Kojima. Meanwhile, the Xbox One is not yet available in Japan, so there's no data to compare, at least for now.