its a better sensor. whatever ergonomics, terrible menus and so on. the final image, its better on the sony, more likely to be taken on time/in focus, better DR/ISO/Colour depth etc. But i understand this is a canon forum and fanboys gonna be offended and start going on about colour science.
Guess what, the final image is heavily affected by the camera's handling. So a camera, that handles better, more enjoyable, less frustrating etc. will actually take better images for most people.
And we can move onto the lenses as well, Canon lenses are big, heavy and very expensive, but also very high-end, they are really hard to fault.
I purposefully left it out because Sony users seems to be overly sensitive to it, but yes, colours are still better on the Canon as well.
Sony is slowly catching up, they are not as bad as they've used to be, but still considerably behind.
The dynamic range is a little better on the Sony, but really not by much and with the latest Canon sensor like the 1DX III, the ISO is not better anymore, it is likely to be similar (the A7RIV actually got a little worse in exchange for more megapixels, they probably employ a bit of clever noise-reduction to the baked RAW files, so it is difficult to compare).
So all things considered, the difference between sensor performance is not that big, but there are other differences, mainly regarded to the camera's operation, that are far more significant and also the system itself, with the lenses and everything.
Jordan and Chris at DPreview posted their comparison of the Nikon, Sony, and Canon camera and I thought I would share some of my thoughts since I shoot on these three cameras. Well, not the A7III but the A7rIII.
alikgriffin.com
Check out this article, the worst part about Sony is actually the community behind it, I have to agree with this assessment.