I once swapped over from Canon to Nikon ... then more recently Nikon to Sony for shooting weddings.
It does hurt the wallet. However, I'm now satisfied, where I wasn't before.
For me and shooting weddings, the primary differences with the Sony are:
A full line-up of Zeiss optics from 16mm to 135mm, and a stellar Sony 70-200/2.8 APO G zoom.
In-camera stabilization so ALL lenses are stabilized including the workhorse Zeiss 24-70, and prime lenses like the Zeiss 24/2, 85/1.4, and incomparable 135/1.8.
Most importantly, the Sony files need less post processing compared to all the other cameras I used before. The files are just closer right out of the camera. This is no small advantage
when you are processing so many images week after week.
Two systems makes zero sense. Been there, done that myself while in the process of switching over brands.
Pick one.
-Marc