chuckroast
Subscriber
The professional support for Canon quickly surpassed Nikon once the EF mount was fully established. The rental sources around here that catered to the pros mostly switched over.
If you were fortunate enough to spend any time around the photographers who covered the 2010 winter Olympics, it was almost entirely Canon.
Nikon became mostly a niche offering - catering to the ever dwindling number of pros who insisted on continuing with legacy equipment.
On the amateur side, Canon has always had a much larger presence in our market.
On the sports photography side, I think that's certainly true. This was because Canon made the very smart move to rent or lend their "big gun" lenses at low/no cost to pro sports photographers. As you looked down the sidelines you'd see these bazookas with "Canon" printed on the side in giant letters. Tremendous marketing move on their part.
But forget the past. Keep an eye out at press conferences and the like. Lots of Nikon still to be seen, though I concur with whomever wrote that digital and film are such different product lines as to almost be like different companies entirely.
As an aside, I am always happily surprised when I remove the rather larger 28-300mm modern Nikon zoom from my D750 and mount a 20mm f/2.8, 35mm f/1.4 or 85mm f/1.4 Ai-S onto the body. The overall balance of the camera gets so much better and the legacy focusing helicoids of these lenses gives me considerably better feedback than the "modern" AF lenses, even when they are focused manually.