....

There is no such thing as the perfect camera is there? Only you can decide which you prefer from numerous factors and it can be as simple as which you prefer to feel in your hand and not only about a list of specs. Is it perhaps a bit like choosing a girlfriend or wife? Oh hang on,
they choose you!
That really is a very lovely portrait on so many levels but I guess it doesn't mean you could not have achieved the same high standard on a Sony. As it appears from your Flickr pages that you own both the EOS-R and the Sony, why not set up the same shot and shoot with both cameras and see which results you prefer?
The other factor to consider is which of the two brands offers you your preferred camera
system overall [says Robin who is probably going to keep his Canon EOS-R and add an Olympus E-M1X instead of his Canon 1DX-2].