JA, your a7RII looks a major step up from my a7II in terms of High ISO. I've been disappointed with the High ISO of the a7II compared to most of my Nikon FFs. The 80-400 afs works quite well on the Commlite AF adapter. If I pre-focus to the general distance it is very fast to lock on. Still not up to action shooting.
Bjørn, I would expect adapters to keep improving particularly if the major lens manufacturers get into the game (ala Sigma's new adapter) . Using adapters is enjoyable due to the lens selection available. The Df brought me back into manual focusing and I use MF vs AF about 50% of the time now with the Df. It is a pain having to set the FL and not having EXIF but the images work. Scouting for old lenses is also enjoyable and cheaper ( I did not say 'cheap'
) .
We are off to the Thar Desert (Rajasthan) next week. My wife and son have it easy. Both shooting EM1's and 6 lenses between them. I'm taking the Sony and Df with a selection of Sony, Zeiss, Nikon, Voigtlander and Leica lenses. Fortunately the carry on weight is cumulative for the family
. The Nikon and 3 lenses weighs close to the same as the Sony and 7 lenses. The only long lens will be the Olympus 40-150 2.8 (and TC1.4) .
It is all about enjoying taking photographs
I did think about taking just the Sony but I am still not that confident in the Sony and the Df is just so good with that 16MP sensor and I can still use CNX2 .
Tom