The produced images are a little darker. The LCD screen is incredibly bright, which is awesome. That said, in post I was able to get the photos pretty close to one another. My D750/24-70 seems a little sharper @ 70, but I'm trying not to pixel peep. I do love that the Sony has this built in tilt display on the screen so that you can actually level off your shot - that'll come in handy.Sorry to hear that. When you say darker, do you mean the lcd screen? Or are the images it produces darker? I don't know how much you can tweak the settings on Sony's. Hopefully it'll be things you can work around. There's always an adjustment period, even from model to model let alone switching brands.
So yeah, I think I need to spend more time with the camera, perhaps even taking it on vacation this summer, before deciding what to do with the D750. I took a few random shots around the house and in the backyard, and the Sony is clearly a little behind, and darker - which I was actually surprised by, given that it's a mirrorless. I guess that speaks more to the D750, though.
I had to photograph a dance studio this week and the LCD touch screen on my z6 would randomly not work. No idea why as the camera's barely used. It seemed to mostly straighten out as the days went on though. Hopefully it doesn't croak on me. If it would, I'd probably pick up a used D800 or D810. They're relatively cheap.
Gonna take it to my daughter's soccer game this weekend and see how it does outdoors and with people in motion. If the AF is as fast as has been reviewed, that would be a big win.
On your z6, if you liked it enough, I bet you could have the LCD repaired/replaced for less than the cost of a D8xx.