July 2017 is the 42nd month of the PlayStation 4 being on sale in Japan. The gap grew in favor of the PlayStation 4 by 77,878 units in the last month and in favor of the PlayStation 4 by 74,161 units in the last 12 months. The PlayStation 3 currently leads by just 89,411 units.
The PlayStation 3 launched in November 2006, while the PlayStation 4 launched in February 2014. The PlayStation 4 has sold 45.06 million units, while its predecessor the PlayStation 3 sold 5.15 million units.