For those looking to buy: I have been shooting with the D800 for a couple of years and was looking for a second camera- have ended up picking up a D810 and alternating them. These are early impressions of the 810:
Picture quality overall is similar to the 800 (that is, brilliant, and allowing for creative cropping without loss of quality) but I like the quieter shutter and the mirror up mode. Group Area focus in AFC needs some more practice, but looks promising. I would like to be able to choose one focus mode for all birding situations, but am still fiddling about to find the best options.
It feels a little more solid and than the 800 and I'm a little more confident of its weather-seal. Shooting speed is noticeably improved (but I could still use more).
Undoubtedly more of a landscape camera, but a shade more adaptable than the 800 for wildlife, I feel.
Bought it at HDew cameras (UK based) - good price and service.
PS bought it eight weeks or so ago and am still waiting for some sunlight here in the North of England to test it properly.
It's not all about MPs - I suspect the new Canon 50mp cameras will have a fight on their hands to better the D810.
True! Higher sensor resolution only fully pays out if lenses have resolving power to match it. Most current lenses will be the limiting factor on the high pixel **** sensors , as many are already on the "only" 36 MP Nikon lenses. There was initially a lot of disappointment with the D800/D800E for users with the wrong glass and too high expectations. The Canon forums will tell a similar story. And to replace those already high end lenses with lenses that meet sensor resolution -if they exist- will cost the real money........
P.S> Sure Nikon will come up with something new at one point .......
I'm loving mine at the moment, I have just bought a second hand 600mm f/4 AF-SII non VR. I still need to get used to it and need to read up more on the best settings for bird photography, and especially birds in flight with this lens. Here are a few images from the past few days.