2015 has come and gone, and Sony managed to see some good success in Japan it appears. Famitsu Magazine tallied up sales of both Sony consoles in Japan for 2015, and the numbers were very solid. The data provided is accurate from December 29, 2014 to December 27, 2015.
The PS4 sold 1.3 million units in 2015, and the Vita sold a tad bit above 1 million. While these numbers may seem a little low, the Japanese market has been on a decline, and saw one of the worst years in 26 years, so that needs to be taken into account as well. The PS4 was only behind the 3DS in terms of system sales.