Shooting in raw and post processing to get the correct shot is not the way I want to shoot. I try to get the correct shot in camera. I can't help the dust once in a while so I use the blemish removal in PS mobile when I can. If you like to process then that's cool, I don't, if I was forced to I would sell all my gear and just use my phone. As it is now, it goes straight from my camera to social media or printing, If it doesn't look good it gets thrown out. I will not bend on that.
Moving to FX only makes sense to me if the bodies will help me lower the ISO and focus better in low light. If it will I will get the one I can afford, which looks more and more like the 750 as it has the better auto focus. The lenses I own, regardless of FX, pro glass, or not, all work with my bodies. I am just looking to kick it up a notch. The pro glass already helped with contrast, flare, and isolation.
As as far as the DF, somethings may matter to someone and not to others. Whatever gets you out shooting. I personally hated having 2 different chargers, the main reason I sold my 3200. It irks me to the point that one camera sat unused. Now that I have one type of battery, one wall charger, one car charger, I can constantly rotate through the bodies. Its a personal preference. As far as the looks, that's a preference and if it did have the battery I would have bought it already, even at retail. I just mentioned it as a afterthought, if you took offense to my opinions then maybe you're the one with a issue.
Maybe I don't belong in this forum as I see a lot of hate going around. I throw out a question from time to time, sometimes I get real answers to the question I asked but most times it's a question that questions why I'm questioning. It doesn't matter why, what matters is the info I was trying to gleen from the collective. I think I'll go back to doing own research, at least I don't berate myself.
The D610 will get you down to ISO 100, but the D810 will do ISO 64 I believe. Unless you meant that you would like cleaner images at higher ISO's, but what do I know? We're just haters around here.