I took some data from the mpost recent 2018 quartely financial figures and it is looking interesting:
The key data is coming from Canon and Nikon who are the only companies giving away at least partially usable data.
Nikon's newest forecast for the total ILC market is 10 million units. Canon pretty much owns that market with a 55%.
And then there are the small players as runners up, like Nikon, who only expect to take 23%.
Everything else is guessing, because either there are no numbers or the numbers are crazy mixtures of stuff.
With only 22% left for all of Olympus, Fuji, Pentax, Nikon, Panasonic it really gets narrow.
I guessed 2% for Pentax, which I think is ok as educated guess.
Then from the monetary sales volume of Olympus (46 bln yen) for their ILC compared to Nikon, the 4% probably is already being generous.
Then there is still Fuji, Sony and Panasonic left.
Throwing the probably small player Panasonic into the Fuji pot there is only Fuji/Pana and Sony left.
Without any relaibale data I just bowed to Sony's ad campaigns and attributed them with a little bit more than Fuji/Pana.
However you look at it: The market today is "Canon and the litle kids". And looking at their profit margins you can also say Canon is the big margin product seller. So the narrative of them just selling the cheap 1000Ds is not true.
If anyone has additional data sources with links, report them please.