You said, "Market position," as in a definition of the group for which the product is designed by the manufacturer. To suggest that Canon designed the 800/5.6 as a lens that, "Generally generates revenue for working photographers," while Nikon designed the 800/6.3 as a lens that, "Generally does not generate any revenue for working photographers," is asinine. Please just acknowledge your mistake and move on.
Market position as of the announcement of the Z 800mm. I am writing this as of today's market condition.
The word "generally" is an adverb that means "in most cases; usually" or "in general terms; without regard to particulars or exceptions." By using that word I acknowledge that these are not absolute use cases. I say this as I often use my EF 800/5.6 to do portraits of people. Why? Because I can and it gives a unique aesthetic. I am told I can use an extension tube on it to act like a amateurish macro lens
How would Canon market the RF 800/5.6 that is 1.42x the physical weight, 2.62x the MSRP but 1/3rd of a stop faster as compared to the Z 800mm? Sales forecast of that lens would now be changed largely because of the recent introduction of the Z 800/6.3
On
BH Photo &
Adorama you can see how it has impacted the market for 800m lenses. The Z 800/6.3 is the most popular mirrorless lens largely because of the price & weight.
Why else would this Nikon lens be that talked about on non-Nikon forums?
Many here may scoff at the Z 800/6.3 because its 1/3rd slower or it being a Nikon but I've spoken to many lens owners that have 3kg or heavier lenses and I have yet to hear anyone preferring something heavier unless it's that cheap.
Everyone replying to me should not take offense about which brand produces a better product. Been on Canon for nearly 3 decades and spoke to Sony, Pentax and Nikon users. It's just basically a see saw. One brand's product/service will be superior for a few months/years then it goes to a different company.
I recall a conversation with a Nikon photographer back in 2004 where in they were admiring the ISO performance of the EOS 10D. He was telling me that working Nikon photogs who make a living with their cameras were often forced to sell their system as it did not have the light sensitivity of Canon.
Back in 2015 Canon users were talking about how much better Sony's full frame image sensors were vs those of Canon. It has better ISO sensitivty.
Now... Nikon has the Z 800/6.3... a 800mm lens prefered by a lot of wildlife/bird photographers based on the BHPhoto & Adorama rankings. Back in 2008-2012 the EF 800/5.6 was the preferred wildlife/bird lens.