If we're just talking FF cameras, I'd be pretty surprised. I rarely see a Sony FF anywhere other than in a camera shop store, and most of them don't even present them out of the box, the way they do with every Canon and Nikon body.
For myself, it wouldn't matter. The usability of the Sony bodies would have to double and the price of top-end Sony glass would need to drop by half for me to seriously consider it to replace Canon. Since I don't think that's going to happen any time soon, Canon is pretty safe, for me.
There are some things that would preclude me from buying a current Sony $3000+ body -- some are features, like the lack of gaskets and any weather sealing beyond "tight fit". Now, I'm a fairweather guy, but I'm not going to buy a top shelf body without. And some are design: I'm not going to spend $10,000+ just to get started with a system that I really don't enjoy using.
If Nikon had a couple of missing/upgraded lenses, I'd think that I'd consider the D850 -- except in reality I wouldn't, because everything is backwards, and it's just too painful to make that switch again. I switched once from Nikon, and getting used to the backwards thing was not fun.