I know three 1DX III owners, as far as I know none of them have ever taken a picture of a bird.
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"....We've got more than a few of the 1Dx3's (over 60 of the them!) and while the birds we take high speed flash photos of tend to be rather dead as part of frozen bird engine ingest and hull impact tests, they are still birds......"
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The 1Dx3 is actually quite an excellent wildlife/action cam. I've taken one out to get images of hummingbirds and the odd eagle looking for salmon. I do must admit Canon sure has got it's colours correct MUCH BETTER than the Sony A92!
Using ISO-1600 at 1/400th of a second shutter speed (You still want a BIT of motion blur so leave it at 1/400th of a second and NOT 1/1000th+ of a second!), you get some VERY NICE photos at 20 megapixels that have little noise and great colours. You can print the 1Dx3's images as large as 13x19 inches at 2400 dpi with error diffusion ON and STILL have great looking imagery suitable for sellable art-house prints.
As a DSLR, you can force the Canon 1Dx3 to keep its mirror UP in high speed mode, which makes it a VERY VERY CAPABLE 20 fps Burst Rate Mirrorless camera! When the R1 goes on sale, I can see that in about two years afterwards that prices on used 1dx3's will be such that I personally think it would be a VERY GOOD IDEA to pick one up on the used market for about $2200-to-3500 depending on shutter count! Just get Canon to replace the mirror assembly for about $500 as soon as you buy it along with some NEW batteries and you will have yourself a PRO-level mirrorless weather-resistant workhorse camera that will last you a full 5 to 10 years if you use Mirror-Up mode for the 20 fps burst rate modes!
AND if you don't already have Canon L-series glass, then I ALSO do suggest you buy on the used market, the SIGMA Art Series lenses such as the 14mm, the 20mm, the 24mm, the 28mm, the 35mm f/1.2 which is GREAT for Nocto/Astro-photography, the 50mm f/1.4, the 70mm f/2.8 MACRO, the 85 mm f/1.4, the 135mm f/1.8 and as your primary sports/action/wildlife zoom lens, the Sigma 150-600mm f/5-6.3 DG OS HSM Sports Lens and the Sigma 2x Extender to turn it into a 1200mm zoom lens and your primes into double the focal length! The Sigma lenses are VERY VERY SHARP and are a LOT cheaper (30% or more!) than the Canon L-series lenses on the used market!
For some artistic specialty lenses, I would also suggest the the Canon Tilt-Shift lens TS-E 90mm f/2.8L Macro and the Sigma 8mm f/3.5 EX DG Circular Canon EF for your fish-eye imagery and the Lomography Petzval 85mm for your swirly art-house looking outdoor portraiture bokeh!
For your night shots and super-surround-view panoramas, I also suggest getting a high-quality slider for super smooth camera movement such as a gently-used iFootage Carbon Fiber Shark Slider. That one offers the best bang-for-the-buck in terms of super-smooth camera movement and outdoor location carry-ability!
Bought on the used market, you can save BIG BUCKS with the above lenses and when those lenses are mated to a used 1Dx3, you will be SAILING into luxury sports/action/wildlife/portraiture photography heaven!
V