I used to have the Sony A7RIII as my lightweight camera as a backup to my D850. As Bernard says the Z7 is a smaller lighter D850. I suspect the AF will not be as good as the D850 but as it’s predominantly going to be my landscape and hiking camera that’s not an issue for me. Having come up through the A7R,A7RII and A7RIII I’m pretty familiar with the pros and cons of EVF v OVF. I cannot believe how good the EVF on the Z7 is, it really is amazing.
I bought the 35 f/1.8 and it’s sharp edge to edge. Not too big, not too heavy, construction seems to be absolutely fine.
I’ve tried the Z7 with my Sigma 135 f/1.8 and I think the AF is better than the D850, I tried it with my Sigma 150-600 Sport and it’s perfectly adequate but not as good as the D850.
I’ve used the FTZ adapter and my Zeiss Distagon 15mm works as expected with the focus peaking being very helpful. The 300mm f/4 PF is a nice size combined with the Z7, AF seems about the same as the D850 using a single point. I haven’t tried the other AF modes as yet.
The main advantages this camera brings for me is that I don’t have to carry 2 sets of lenses and the controls are sufficiently similar that I’m not reaching for the wrong button. The menu structure is very, very familiar too which helps enormously.
I’m happy. Need Capture One Raw capability now.