The D750 can focus in darker conditions than the D810. Which isn't that big a deal because we rarely shoot in conditions that dark, but still weird.
But for a wedding photographer, it doesn't.
I don't know.
I feel like its just an upgrade from d6xx series. But still a good camera thou.
And the number d750, that got everyone thinking it was an upgrade from d700. Which I think it's not ... :dunno: