Nikon stirred a lot of dust introducing D800 and D800E models earlier this year. The main reason was massive jump in resolution: at 36 megapixels, D800 is highest resolution camera on the market (except medium format) and a huge shift since its predecessor – Nikon D700. D800E differs itself from regular D800 by lack of anti-aliasing filter. In practice, images will appear slightly sharper but with more chance to get moire effect. In every other aspect, both cameras are the same.
Its main rival is Canon EOS 5D Mark III, which I reviewed a few months ago and you can read about it here. Since the late Photokina fair there is also Sony A99 which with its SLT technology and few unique features is a beast of its kind.