I have the A7ii and like it. It's made out of metal and feels good in the hand. It could have better battery life, and it would be nice if it didn't use lossy compression on the RAWs. That said, I've never run out of battery or noticed the compression artifacts. It takes super-sharp pictures of any scene I can throw at it, landscapes, people, the night sky, etc.
The AF is not great, I always notice myself wanting a bit more sharpness from shots where I wasn't thinking and let the AF do whatever. If I care I manually focus, and then things are sharp even when looking at 3:1 magnification. I've tried a friend's Nikon D750 and was blown away at how fast the AF was compared to Sony's, but I don't know how accurate it was.
The Zeiss-branded Sony lenses are amazing, though there is a limited selection compared to Nikon and Canon, who also make great lenses. Thanks to the missing mirror, you can easily adapt any lens you want onto the Sony body. I use a (manual-focus, of course) Nikon 28mm lens. As I understand it you can adapt Canon lenses to the body and still get EXIF, camera-control of the aperture, and AF, but I haven't tried it.
Software for DSLRs is never good, and Sony is no exception. I don't have a flash attached to my camera, but if I try to turn the flash off (it's currently in "W" mode), the camera says "setting not available in aperture priority mode". The functions you can map to buttons is stupid (no one-button focus magnification, the only option is a two-step operation). Their auto-ISO algorithm also makes stupid decisions when you give it other variables control. Set the lens to f5.6. Point at something bright. It decides ISO 1600 at 1/8000 shutter speed. WHY.
That said, you can basically point the camera at something vaguely interesting and the photographs are great, so I won't complain. I took up medium format photography recently and my list of mistakes is impressive. I have an entire roll of film showing detailed views of my lens cap, for example. I have some other pictures with perfect composition and exposure ... that I forgot to focus. This modern technology is quite useful, even if annoying when you're looking through the EXIF information and thinking "I wish the camera chose ISO 100 here...".
So in the end I like the Sony. And it's sure small and easy to carry around compared to a "real" DSLR, though still more imposing on your subject than a Leica.