EDIT: Forgot to add that for some time Nikon is selling better than Canon in Japan. An interesting reversal compared to previously. That Japanese consumers are very prone to switch to have the "newest" and "brightest" electronics has certainly contributed to this.
Not according to BCNRanking for the first half of 2014.
I am also curious about your source of info. Granted BCNRanking does not cover small dealers. So, I am wondering if there is anything better than BCNRanking.
Certainly when it comes to worldwide sales, Canon has been leading the pack for interchangeable cameras in the past few years.