Yep, that's exactly what my A7S suffered from and the repair cost wasn't worth it, with no guarantees to not break again. I am not sure if that's changed in recent times.
For the high res sensor part, let me correct myself. I would say the photos weren't materially different just because of the resolution. I am sure there are a few moments where cropping isn't as horrendous 26 MP -> 14MP before where as now I'm at 40 MP -> 23MP. On a photo by photo comparison the photos are pretty close.
I think it looks especially good with the first 2, where we have lots of texture to play with. In that sense, I think it feels more at-home with the backgrounds there.