I've been reading a lot of posts here plus a lot of reviews and examples on Youtube. It's evident people are using a couple of those for weddings professionally and getting some good images. But from what I gather, the A7R iii or A9 make the A7R ii seem like a museum artifact. Apparently native glass is a great option, because there's plenty of honest reviews on Youtube showing inconsistency with 3rd party glass.
I use Canon and considered adding Sony. But Canon, Nikon and Olympus are all so good now, that changing systems is pointless. But from all I read and saw, if I was to add a Sony, it would be at least an A7R iii and I wouldn't touch an A7R ii with a 10 foot pole.