August 2018 is the 55th month of the PlayStation 4 being on sale in Japan. The gap grew in favor of the PlayStation 4 by 42,573 units in the last month and in favor of the PlayStation 4 by 366,597 units in the last 12 months. The PlayStation 4 currently leads by just 349,957 units.
The PlayStation 3 launched in November 2006, while the PlayStation 4 launched in February 2014. The PlayStation 4 has sold 7.01 million units, while its predecessor the PlayStation 3 sold 6.66 million units.