Canon has been the leader in the sports and press fields with DSLR cameras until recently, although it has maintained a good reputation with videographers. Sony the largest company and is dominating the mirrorless arena, while Canon is second. Now both Sony's a Canon's eye tracking and autofocusing are close to each other, and Nikon may be just a tad slower. Nikon still can be a player in the mirrorless-camera arena, even if being a small company compared to Sony and Canon. In my view Nikon will do just fine as long as they support research and development, plus careful marketing. Just look at how Fuji maintains a portion of the market while the big players fight with each other
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Sony is doing great in the camera and lens market. And now Canon's R5 ad R6 are big sellers, since with the EF to R adapters that are being offered by Canon and several manufactures, one can use all the older Canon lenses, plus other lens brands with EF mounts in addition to the new RF lenses. The demand for EF and R lenses (plus adapters) is so high at the moment, that most major stores have them on backorder. I had to wait several weeks for a Canon EF to RF adapter.