ISO 6400 Comparison: Canon EOS R vs Nikon z7 vs Sony a7r III High ISO Shootout

Since we've got all of them in right now, we wanted to know how the three current kings of full frame mirrorless perform when it comes to high ISO output testing. If you look around on the web, it generally seems like Sony is the best option all around for lenses, image quality, etc. Nikon arguably uses a Sony sensor but Canon is using their own unique sensor. Canon also has less megapixels for what it's worth and to that end doesn't always render as much detail in the images. But in my testing,...