I just bought a D750 and so far I'm very satisfied! Nice camera! My question is... what are the main difference between the D810 and D750? I know the sensor size is different, but the lens are the same (FX). So in the real world, what would be the advantage of the D810? I do not shoot video at all (other than some obligatory grandkid stuff). I do mostly still photography, so would it have made more sense for me to have purchased the D810? Just curious since the price difference isn't all that much. Thanks.