Nobody but Canikon has a 600 f/4 - or the aperture-adjusted equivalent. Nobody but Canikon has $5,000 bodies that can shoot a billion frames a second and focus in the dark. Nobody but Canikon had full frame...until recently.
But by volume Canikon is the vast majority of the market. Sony have barely any market share and the others even less. When pros choose cameras, and by pro I mean someone who needs professional level support because their income depends on it, Canikon is the only game in town.
The cameras amateurs deride haven't had studio lighting support until very recently - and, even then, no Profoto.
You would be right but Ameuters aren’t deriding amateur cameras. They look down their noses at Canikon because the bodies lack features the newest Sony (usually) already has. What I am highlighting is the ridiculousness of the “I am switching because the new X does so much better at 3200 iso” crap.
See all the people writing off the new Canikon mirrorless systems because some Sony cameras have features the announced bodies don’t.
...and a huge number of MILCs on gimbals. Ironically, it's often 4/3, too - Panasonic GH- series is incredibly popular as a B-camera for its' ability to do more or less everything reasonably well.
Panasonic solved video cooling before everyone else. More importantly professional video has never been full frame. Amateurs confuse what movies call 35mm with what photographers call 35mm and this think m 4/3 x which is almost exactly super 35mm - is a step down.
They also miss the fact that lenses are vastly more important than sensors for pro video as low light performance on film has always been poor.
Then why is everyone buying Sony in droves? Possibly it's the ease of use with flash (you can see what you're doing in the viewfinder!) and the manner in which EyeAF means f/1.4 is no longer a miserable crapshoot?
This is the heart of it. They are not. According to Nikkei the market for interchangeable lens cameras as of 2018 is - Canon: 49.1%, Nikon: 24.9%, Sony: 13.3%. As for growth rates while Canon and Sony gained market share (3.9% and 2.9%), Nikon lost 0.6%. Sony isn’t even growning faster than old Canon and Nikon sell double.
People online are deluded. The reason Canikon have been slow to enter the mirrorless market is because Sony isn’t breaking records. People online seem to think Sony cameras sell like iphones. They don’t. Canikon isnt trying to copy Sony, they are trying to avoid their mistakes.
Also Nikon are by far the smallest company overall and the only one which only does optics. They have had real problems of late and have always been extremely conservative. Expecting them, or Canon, to release cameras which disrupt the market significantly is naieve.