More from VGC Database:
Wii U has sold 16.8 million first-party with a total of 23 million retail software. (73%)
Taking away not "full" first-party software
(Just Dance, Ninja Gaiden, Sonic LW, W101, M&S at Sochi, Monster Hunter, ZombiU, Lego City)
Wii U has sold 14.1 million first-party with a total of 23 million retail software. (61%)
PS 4 has sold 3.75 million first-party with a total of 16.3 million retail software. (23%)
Xone has sold 3.27 million first-party with a total of 12.5 million retail software. (26%)
I did not think it would be that much of a difference, Nintendo fanboys really are another kind of gamer!