According to Enterbrain figures, the Xbox 360 and PS3 have both achieved milestones in Japan. As headlines would have you believe, the Xbox 360 has surpassed the one million mark for consoles sold, whereas the PS3 has done much more admirably, pushing over three million systems on the populace. The Xbox 360 achieved this after almost four years on the market (it released in Japan in December, 2005), wheras the PS3 claimed its figure nearly three years after launching in November, 2006.
Clearly, both consoles are big in Japan. Mostly because they're huge consoles.