I have no problem with your (or anyone) finding the D800 a highly desirable product, as I agree. Nor do I have a problem if you (or anyone) decides its a better camera to use than what you are now using as long as it actually relates to your photography - either the process used to take a photo or the end results. My only "complaint" is those who talk about buying something or switching brands siimply to get the latest/greatest product, thus my question about how it would better satisfy your photographic needs. Of course, if money is not a concern and you can get it if you want to, more power to you.Let's say that it is a mixture of excitement/curiosity for a new product. By the features, the new D800 is largely superior to the a900, but both camera are capable of delivering fantastic results.Why? What about the A900 and CZ 24/2 do you find unacceptable? For what purposes will the D800 better satisfy your needs than the A900? If it relates to video, fine. But if it relates to still image quality, are you really a member of the teeny, tiny minority for whom 36MP would make a practical difference compared to 24MP?This may very well be a good bye to my recent a900 + CZ 24 MP. At about 3000 K, it looks like the new D800 is rather a big winner.
I am not saying I will sell the a900 + CZ 24-70 lens right away, but depending on what the D800 is capable of, I might be inclined to switch from Sony > Nikon at that price. Time will tell, and it will take at least six months since I can make such a decision.
From my personal perspective, after shooting several months with an A77, I find that the EVF is too limiting at times for some of the photography I like or want to do. Assuming the A99 has basically the same EVF functionality as the A77 (and recognizing that Sony has indicated it will not make any future OVF cameras - though it is free to change that "decision"), I have serious doubts that it would be a "suitable" upgrade/replacement for my A900 and that Sony is the right system for me going forward. Thus, I find the D800 a very intriguing camera, along with everything else Nikon is doing (e.g., D4 and faster release of new lenses). But, money is an issue and I have no burning desire to switch systems (which will cost me thousands of dollars - e.g., replacing my well-used Minolta 600/4 and 300/2.8 lenses).
My own "guess" is that there are a number of other higher end Sony shooters who may be facing a similar issue.
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Mark Van Bergh
http://www.markvanbergh.com