For all the people who have left high end DSLR to go to high end mirror less, I’m genuinely curious how the viewfinders compare in quality. I’m behind the times

For all the people who have left high end DSLR to go to high end mirror less, I’m genuinely curious how the viewfinders compare in quality. I’m behind the times with an A6000 but have always been kind of disappointed when looking through the viewfinder compared to similar gen mid level DSLRs.