Yup D810
Although it was only replacing my second hand D800, so not quite the massive jump, had a fair few old bodies between the 350d and this, but it's only the second camera I've ever brought new.
I've only just had a chance to have a play with it so here's my initial impressions.
The new shutter mechanism sounds amazing and feels so much smoother although imo the new quiet mode feels louder then the standard mode.
The new viewfinder focus points are much more crisp but while the white text is nice It wasn't the wow factor I thought it'd be.
The new group area AF looks fantastic and I like how you can change the display from spots to squares although it would have been nice to create a custom AF group layout (not sure if you can?)
It feels much more responsive in both menu clicks are preview, I'm not sure if it was on my D800 as I never found it but I like the option to put a viewfinder overlay on top of the preview showing the af selections.
And last but not least how it feels in the hand, I've progressed from the D700, D800 and now the D810 and while it doesn't have the quality feel of a D700 it definitely feels better in the hand then the D800, the grip feels deeper and the rear thumb rest feels like the D700 again which is I nice as I nearly dropped my D800 when muscle memory kicked in and expected more of a rest :O
However I can't get over the feeling that the body feels different, I'm still undecided if it's that new camera feel or something but the body definitely has a different texture which feels slightly cheaper although lighter and also slightly weird with a heavy lens on.
Looking forward to a shoot I have next week which will give it a real test