can you shoot photos with tripod?
1/200 might not be enough hand held.
also are you shooting wide open? maybe something around f8-10 will work better.
the other thing do you need to adjust autofocus for that lens? it could be slightly off. i assume the sony will let you do that.
one more thing you could try is adding a bit of local contrast. with something like clarity in lightroom.
I would have thought that the a7rII would have been a very good camera for this.