If you weigh up the pros and cons, so far anyway, it purely comes down to ergonomics, the AF and lens preference.The R5 does look like an impressive beast. More than I'd like to spend but certainly a great marker for Nikon to compete against with a new camera release in that price range.
To warrant spending so much on a camera I'd need to be either shooting a lot more than normally or making money from it, neither of which is likely to happen anytime soon.
Hopefully we'll see in-depth reviews soon showing some improvements.
Other than the simply brilliant 600/11 the Nikon lenses in my view have an edge. The lens I use most, the 24-70 is significantly lighter than the Canon version. The canon lenses have much more focus breathing. But you can get an 85/1.2 if you want it right now, although it's big and heavy so for me I don't think I do.
Ergonomics I like the feel of the R5 body, but a few of the buttons and functions to assign to them are a bit odd. You'd get used to the different menus really quickly as they are very similarly grouped etc.
AF, well I'm hoping to get a better idea of that soon but so far, strike one for Canon.