For the 2012 statistics, BCN Ranking has split these into two categories: DSLRs and mirrorless. This makes sense, of course, but the downside is that I cannot continue my time series of statistics. BCN only give the percentage of sales, not the absolute number, hence I cannot recombine the two categories.
Anyway, let's see what the 2012 statistics for the mirrorless category looks like:
And when summing up per camera system:
Just like the previous statistics, these are based on the twenty most sold camera models. This means that you cannot expect the percentages to add up to 100%. There is still another 9% missing. In the missing category, I would expect that you find cameras like the Panasonic G5 and GH2, among others.
Micro Four Thirds has a very healthy lead in the mirrorless camera category, at 50% market share. I would attribute this to the fact that they launched their system early, and have a lot of quality lenses out.
One could expect to find the Samsung NX system on the list. On the other hand, it is fair to say that there is some rivalry between Samsung, which is a Korean brand, and the other manufacturers on the list, which are Japanese. While Samsung does not sell well in Japan, I think they do better in other markets, like Europe.
The Nikon 1 system is already at a good market share of 13%. They have a very strong brand in Japan, and have invested heavily in marketing. The volume models, the J series, look cute, with various colour schemes, and a clean design with geometric shapes.
The Pentax Q system er quite odd, in my opinion, with a very small sensor size. At this sensor size, I think most people are better off buying a premium compact camera, like the Panasonic LX7 or Olympus XZ-2.
The Pentax K-01 is also an odd machine. It shares the lens mount with the Pentax DSLR cameras. Hence, it is a mirrorless camera with the register distance of an SLR. While sharing the lens mount has some advantages, it also means that there is little size advantage to the mirrorless system. Because the camera needs to be as large (except for the pentaprism), and the lenses cannot benefit from a shorter register distance.