So if image quality is top priority, go full frame and try and stretch to a7iii for the much improved AF and battery life. The a6400 with that good sigma glass (the 56 is stellar) is also an excellent choice if you can’t stretch, I personally wouldn’t get the a7ii over it unless you’re very much set on full frame.
The A7sIII and the A7III are both great cameras. I compare both in photography and video work to help you decide which one might be best for you. The Sony A7 The highest values become pretty useless: the A7 III shows a green cast whereas the R6 has magenta colour artefacts. The Canon has more noise as well. With the SOOC JPGs, the A7 III shows more colour noise when Noise Reduction is turned off. The R6 image is cleaner with NR set to Low or Standard.A microphone port allows connecting external high-end or specialized microphones. has a socket for a 3.5 mm audio jack. Nikon D7100. Sony A7 II. With a standard mini jack socket, you can use the device with most headphones. has a stereo microphone. Nikon D7100.I think a great solution is to at least compare micro 4/3's and i can speak from 1st hand the Panasonic G9 (IBIS body) as well with the 12-60 mm F 2.8-4 and one lens I have my eye on the Pansonic 50-200 mm 2.8-4 a 100-400 equivalent. it is like $1000 less than the Sony version for the A7. I am a A73 owner btw