Douglas L
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Bill Gass wrote:
Douglas,
Have you shot with the Sony a7R V or the Sony a7R IVA ?
I think the V is going to my next camera.
I just bought an R7 to check out Canons blazing fast auto focus ( so their site says ) but didn't work for me so back to B&H...Been wanting to try it since it came out tho.
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Maybe there is a sony camera to canon lens adapter 
Bill, there are several adapters to use Canon lenses on Sony E mount cameras, the best one is made by Sigma (MC-11?). Personally I wouldn't use lenses for different brand on Sony cameras with an adapter for fast moving stuff, it slows down the AF. Besides, you get no more than 15 FPS with non Sony lenses on the fast Sony cameras. Even Sigma/Tamron lenses specifically made for Sony E mount can't get faster that 15 FPS, because Sony doesn't want them to be able to compete with Sony lenses when it comes to FPS.
I have not shot the A7R IVA, but had the A7RIV, the IVA version is exactly the same except it has a newer and higher resolution LCD screen. I have the newer A7RV which has a fantastic AF system with the dedicated AI chip for AF. BUT, a big BUT, it only does 10 FPS, which is pretty lame by today's standard, and an EVF that induces blackout, like most of the mirrorless cameras. Once you shot a camera with no EVF blackout, it's very hard to go back. In my recent air to air shoot, I used an A1 and an A7RV, because I sold one of my two A1s after I bought the Nikon Z8. The A7RV's EVF blackout bugged the hxll of of me. I think it's perfectly fine for not too fast stuff, landscape type of things. But for shooting fast moving subjects like planes and birds at higher frame rate, I will stick with cameras with stacked sensors (which enables blackout free the EVF), that's why I bought back another A1 two weeks ago.
As far as I know, right now the only body with stacked senso in Canon land is the R3, the R5's EVF is almost blackout free from what I read, but I have never shot one myself. In Nikon they have the Z8 and Z9, in Sony they have the A1, A9, A9II. I know the Sony A9III has a global shutter, I am not exactly what they call the sensor in that body.
Personally, if I wanted to try a high resolution camera with stacked sensor and blackout free EVF, I would look at the Nikon Z8, Z9 or the Sony A1, the Canon R5 can be pretty close. Jim has an R5 so he could offer his opinion. But the R5II should be out soon....
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...But a great pix.