http://bcnranking.jp/news/1212/121228_24511.html
(in Japanese)
As for the mirrorless, the top 20 models equal to 91.1% share of the total market in 2012. The Pentax Q is ranked at No. 8 while the K-01 is just at No. 20. The total Pentax brand share is 7.1%.
As for the reflex, the top 20 models equal to 95.4% share of the
total market in 2012. The K-30 is the best selling Pentax model, followed by the K-5, which are ranked at No. 13 and No. 14 respectively. The last big 20 Pentax DSLR model is the K-r, which is ranked at No. 19. The total Pentax
brand share is only 4.5%.
It is somehow surprised that the Pentax Q has been the best selling Pentax interchangeable lens camera model in the Japanese market. And after all, Pentax is still alive and let's see what will happen in 2013! :-)
p.s. Btw, I am sure that I am contributing to the survival of Pentax as amongst those five top-selling models, I have yet purchased and own three of them! ;->