I thought that I would write a summary of my 6 months after switching from Canon (5D3) to the A7x system - Things I love, things I wish were different and just general thoughts on the system. I held off waiting to write this until I completed my first wedding using only a A7II and A7. I had a lot of questions and concerns about the feasibility of the transition but now I can answer to a lot of those questions.
I take pictures as a hobby all the time - mostly landscape and people in that regard. For my part-time professional work I do product photography, portraits, weddings and dabbled in other areas too.
Here is what I brought with me to the wedding:
FE 55mm 1.8
FE 70-200mm 4
FE 35mm 1.4
Canon FD 24mm 2.8 SSC
Canon FD 85mm 1.2
Metz AF64 Sony Flash
Yong 430 Flash as backup
With that setup there wasn't anything at the wedding I couldn't handle. If I stick with the A7 system I will definitely be swapping the A7 for an A7S tho.
I ended up using the A7II for 90% of my shots because the AF really is THAT MUCH better. When using both cameras inside the church during the ceremony the A7 was not efficient. I ran into no problems with the A7II. Because of the EVF and live preview I had more keepers and less overall shots (because I didn't have to take a picture then correct). The menus, custom buttons and custom 1 & 2 setting made it a breeze for me to quickly change settings and adapt to the situation. Overall I had no issues with the camera and the focus tracking inside the church was substantial for the bride walking down the isle.
Really I only have three drawbacks that I can think of at this point.
1. Battery life - it would be nice if it were closer to DSLR but I get that you can't have it small and light and take 1000+ shots. I found each battery lasts about 350 shots. The nice thing is that aftermarket batteries work great and are cheap tho.
2. AF could still be better. While I didn't have any real issues with AF (on the A7II) there is always room for improvement (especially if trying to track fast moving objects).
3. Not true 14bit raw files. This is the point that drives me NUTS. I'm not here to debate if there is real world effects of the lossy files but the fact is - there isn't as much info in the raw files are there could be. This bothers me a lot - I get that if you compare it to a D750 you prob have to boost the shadows to some ridiculous level to see and only in certain situations but the fact that it's not all there still remains. I can't help but to wonder if my photos could have higher quality raw data or not and how that might effect it. I think it's ridiculous that Sony claims 14bit raw when that is just not the case.
Hope that helps anyone that is looking to dive into sony.