Well the D3, D4 and D5 are quite similar in grip shape (only relatively small differences between models). The D750, D500 and D850 seem to have narrower and deeper grips.So it seems Nikon feel they’ve made an improvement and are putting the new grip shape into all bodies of this class. I disagree that it is an improvement but can live with it, grumbling a bit perhaps. I am pretty flexible and usually adopt to the new stuff after a bit of use. I read that the MB-D18 (vertical grip for the D850) does not share the deeper and narrower grip of the main body, which is good for me. However it appears the alignment stud is plastic in the grip and there is reportedly a bit of flex between the grip and body. This is not a good thing if true. The metal stud of the MB-D12 made the grip mount firmly to the D800/D810.