I guess replacement is not another lens...This
"Canon does not need another $10,000-$15,000 big white lens."
and this
"The current versions [ RF 400 F2.8 L & RF 600 F4 L lenses] were designed for the EF mount, so it's time for native RF mount versions."
Interesting seeing the author disagreeing with himself...so I don't have to.
Be sure to stamp your foot a little bit, it will make the threat more effective and ensure that Canon responds to your demand in a timely manner.
I'm sure Canon can differentiate between a threat and a customer voice. Spending my money with other companies isn't a threat, it's a business decision as much as Canon has to decide if they want to invest now on new big white prime lenses with certain features. I bought the EF 200-400 4.0 with build in TC, as I thought and still think it is an amazing idea. Unfortunately, not Canon continued to implement it but Nikon did. So far, Nikon is a bit behind in AF capabilities but I would expect this will change with the next generation Z9. Canon needed quite some time to get a competitive mirrorless wildlife Cam into the market - they finally did with the R5 II but the big white lenses don't cut it, especially with such a price tag. I would like to replace my EF lenses for lighter RF lenses. Mid 2026, I would predict, that many people will go for Nikon in a comparison a R5 II + RF 400.28 vs Nikon Z9 II with the Z 400mm 2.8 with build in TC (if Nikon manage to get this Cam out and if Canon is not refreshing its big white 400mm and 600mm primes). Just my opinion, no threat, not happy if I have to change to Nikon but in my opinion Canon will not convince me and others with its current offering.A tale as old as time. For Nikon's sake, I hope you're right! They need the custom.
And I thought Canon had already lost every single wildlife photographer, you must be the last survivor!
it definitely changed a lot, I wonder if this is Canon strategy or just Sony and Nikon prioritize this niche more? Let's see and wait, at least a little bit longer 
- It is definitely a good thing that we have now 3 major competitors fighting for our money .totally with you on that, hearing it even for 25 years
.I would never switch overall. But, I'm not talking whole camera market, I just focus on wildlife photography as I focus on the super tele lenses. This niche market was dominated by Canon for a very very long time, similar to Sports using the same equipment. After Sony came in with great AF in their mirrorless (toy) cameras but not super great lenses - still a significant number switched. With the Z9 and the 400 2.8 with TC in 2021, Nikon had an OKisch AF and the best Lens on the market. More switched, even in not so easy times after COVID. Since then Nikon pushed a lot for high quality "mid" price range super tele (600mm 5.6, 800mm 6.3) and updated their camera software far more than Canon. So you see definitely more effort from them, as they know they have to win over customers.
Oh, well ok then. A niche market.
Right, because not making a couple of mid-range lenses for a niche market for which Canon already offers multiple relatively inexpensive and very expensive primes, as well as inexpensive and mid-range zooms, is totally analogous to the film to digital paradigm shift.…as once Kodak did
For Macro alone, Venus Laowa has an amazing 180 4.5 1.5, but I know, some folx want AF for other things as well (oh and macro too lol)
i think this concept works for shorter tele also. start with 200 F1.4 for example! i forget where, but i read somebody claim that built in tele converters are less reliable than external ones. i havent any experience with lenses with built in converters -- are they a problem?
Do you have data to backup your claims?totally with you on that, hearing it even for 25 years
As I said before, I'm not looking forward to have Canon and Nikon in my bag. I would love to see more effort from Canon to keep me as a local customer also for my wildlife photography. If Canon come to the conclusion, we don't need this niche anymore, we found e.g. video content creators as our new focus customer group - bad for me, but as you said, they probably continue to dominate for at least a couple more years the overall market - as once Kodak did
