BCN have release their rankings for 2017. These numbers represent about 50% of all Japanese camera retailers, so the numbers do come from a long sample. These numbers do not reflect sales in the rest of Asia, Europe or North America.
Digital camera (Compact)
- Canon 27.9%
- Nikon 25.5%
- Casio 17.2%
Digital camera (DSLR)
- Canon 61.1%
- Nikon 34.4%
- Ricoh/Pentax 4.2%
Digital Camera (Mirrorless)
- Olympus 27.7%
- Canon 21.3%
- Sony 20.2%
Interchangeable Lenses
- Canon 21.9%
- Sigma 16.2%
- Tamron 13.7%
I'm surprised to see Nikon fall out of the top 3 in the Interchangeable Lens category. Sigma and Tamron must be doing a lot right.