As Joe mentioned, PP is No. 1 here in Japan. It is a very competitive market with most brands being very well represented (just look at the number of VC ADs in Japan!). Here too, PP's massive marketing machine is in full steam with PP ads visible in magazines, posters, and even in newspapers! Of course, this does not mean that PP is just advertising. It just goes to show how far a great watch, coupled with superb marketing can go.
What celebrities wear really influences the popularity of brands too. Frank Muller, Roger Dubuis, Bvlgari, Cartier, and of course the staple Rolex are also popular with the less horologically knowledgeable, or designer brand concious rich.
VC also has its following, as evidenced by Japan LE's being released every year. But it seems that we are a more quiet group. I really do not bump into many fellow VC fans here and I believe VC appeals to an older audience on average.
I am sure Breguet and AP and Lange are also doing well here. I really should ask my AD about the sales rankings here.
Thanks for the interesting post Rei.