I've never said that I'm not an EVF fan just that I prefer the look of looking through optics, but I also said that I like some of the advantages of EVFs.
It is a bit of a 'dilemma' tbh. Yes I could stick with what I have in. the D750 and EM1, and I've been really happy with them. No they're not perfect, and I do find the AF spread of the D750 limiting at times, but at the end of the day both are cracking cameras.
I do admit that I have an itch though, and I do like trying new stuff. I know that it won't improve my images, but it's sometimes nice to have something new and different to play with
I've been back and forth with both the A7Riii and D850. The A7Riii would allow me to have a one camera setup, will deliver stellar IQ and 'should' be good enough in terms of AF. I'm hoping that it will lighten the load in certain situations due to the extra res and cropping, so I could use a 100-400mm instead of my current 150-600mm for example. The only possible negatives that I can foresee is the balance with larger lenses (and the effect the shallower grip has on this too), but not having had the chance to try this I can't comment for sure. And of course whether AF is truly good enough.
I could get the D850, and when this first got announced it was a camera that I seriously wanted. However, as I've mentioned previously I've been using my EM1 more of late (due to holidays) and have really enjoyed using it over the D750. Now I know that the A7Riii isn't as nice as the EM1 ergonomically, but if it's not far off and for general stuff the weight isn't too dissimilar then the A7riii is appealing, and the D850 less so. The other negatives of the D850 are the price of the XQD cards, they are very expensive. I know that the Nikon has the advantage of lossless compression so I wouldn't need as much storage on the XQD cards, but 64GB xqd card is £110, vs £36 for a 64gb Sandisk Extreme Pro CD card. Also, I'm unsure of the future of XQD cards. The other disadvantage of the D850 is that I would still need a two camera setup, meaning that I wouldn't have FF for travel. Advantages of the D850 over what I have now is the high res for cropping, stellar IQ, wider AF spread and better buffer. Oh just thought of another disadvantage of the D850, the grip is £350 (similar for the Sony one although I'm sure there's 3rd party ones for each) and then you need the charger at £190 and the batteries at £170 each if you want to get the full frame rate from it
So there you have it, that's my full thought processes at the moment. I am seriously leaning towards the Sony at the moment due to having FF for everything, the possibility of having a lighter package at times, and scratching the itch at trying a new system