Df owner here.
It is a sort-of dumbed-down D4 as mentioned earlier. Same sensor, but without all of the shit that makes a D4 what it is. It uses the same battery an entry-level D3500 uses, all of this is to save weight. Body by itself barely weighs more than a 70's Nikon FM.
I have had mine apart, the build quality is less than spectacular. Don't drop it, ever. Don't even get it wet. There is NO weather sealing. It will shoot every Nikon lens ever made in F mount, yes, even that one. The AI tab folds and you can go all the way back to 1959, it is the only DSLR that can do this.
The good stuff. Image quality is stupid for something of this era, and it better be it has a sensor lifted from a Nikon D4. The AF isn't, I believe that's from a D7xxx but it's still pretty good. Low light capability is astonishing even by today's standard, The Auto ISO is pretty good. It's very light and carrying it is a breeze especially with an old AF-D lens or even a newer Sugma ART prime lens. I do like the dials and manual controls but they are very easy to get dirty especially if you use it a lot. AF will find things in low light if you have a decent prime lens on it <f/2. The shutter is quiet and it really does feel like shooting a digital FE2.
Now for some gripes. The rubberized grips are shit and even with less than normal use, only last about a year, maybe two if you're careful. The paint scratches off easy, somewhere there is a picture of the back of mine and almost all of the paint is worn off of it. The whole bottom plate is metal but the battery door is plastic and the build quality for something that was god damn near 4000 USD brand new is atrocious. Despite being able to shoot every Nikon lens, no split prism finder, this is fixable though. The outer shell is metal but the whole frame inside is fucking plastic, all of it, the whole camera is made of plastic. It's built like a house of cards inside and the whole top plate comes off in like 5 minutes with basic hand tools.
