Dave Cheung gives us a great look at the differences between the body of the Nikon D750 and Nikon Df. He shows us all his likes and dislikes between the two models and how each feels better of worse. Great news, the new D750 does not have the same problem with the battery door falling off all the time like the Nikon Df.
Dave Cheung’s site here.
Best prices on the Nikon D750 here and here.