You can't beat Hasselblad colours.
I've got an A7RII, and while it is a technical tour-de-force, I have a similar experience as you've had with the Canons- always trying to coerce the colours to where I want them to be (within my preferred image processing chain).
It's amazing how good a job a small boutique company like Hasselblad has done compared with the scientific might of Sony, Canon, Nikon et al.. Even more so because their colours somehow seem to stay good regardless of whether one's preference is subtle and naturalistic or whack up the saturation to three notches beyond Velvia (which my proletarian tastes tend towards). It takes a LOT of provocation to get Hasselblad colours to fall apart, especially in Phocus.
I do find myself using the Sony a lot. Its shooting envelope is very broad- low noise, high resolution sensor, image stabilisation and some cracking lenses. Capture One does a decent enough job with the colours. But I don't love it the way I love the Hasselblad.
If I had to buy a single camera system for everything I think I'd still go with a 5DS or a D810. But Sony is innovating like all heck, and if you don't have an ultra-pressing need, I'd wait to see what the sure-to-be-coming A9R or A7RIII is like.
Cheers, Hywel