Sony becomes the Number 2# on the Full-Frame market both in US and in Japanese. Canon is still in the first position and Nikon is the third.
1) Between January and September of 2017 they claimed the second position on the Full Frame market. With the first position likely to be held by Canon and the third position by Nikon.
2) Sony lens sales are up 56% YoY (Year-on-Year) (Jan-Sep 2017 vs Jan-Sep 2016) by value compared to a flat market.
3) Sony Full Frame (35mm) camera sales are up 57% YoY by value, compared to the rest of the market being down 7%.
(Source DC.watch):
1) Sony owns 29% market share of the FF system camera market in Japan. That makes place two behind Canon
2) They have a market share of 18% on the overall system camera market in Japan
See also 2017 Black Friday & Cyber Monday Sony Camera Deals
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