I recently had the opportunity to play with a prototype D4 and was quite impressed. There were a couple of things which disturbed me about the camera (including the new Memory Card System), but to me it is a much better fit than the D800. Luckily, I am still very happy with my D700- I can't imagine wanting to carry a tripod everywhere and updating my glass collection in order to be able to resolve well enough to justify that D800 update.
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2014- The journey continues