IT´s a beast of a camera!
Changed form the D800 ( which I plan on keeping as my second body) and spent two weeks with it this past month in France. There is definitely a learning curve and if you are planning on getting it, I urge to buy Thom Hogan´s eBook-it´s very detailed (this is my third Hogan eBook) but very worth the time to study it. The camera is amazing in so many ways but what impressed me the most is the sensor´s ability to perfectly capture underexposed shots. The detail is amazing. It offers really fast continuous shooting, ridiculous shutter speeds and ISOs off charts. I shoot in manual mode mostly and found it to be very friendly and easy to control. I was debating about the mirrorless camera but I am very happy with my decision to go with the D850 for many reasons. Probably the best digital SLR ever made, to date.