Well I have printed out the full size D800 samples that are available. I know the current thinking in DSLR land is that you can never have too much detail.
Yeah, you can tell what fantastic detail there is just viewing these jpgs but to me, the real proof is in the print. Just as expected, the detail in an actual print is just as astounding as you would think it would be and and while it is amazing, I also see that it may require even more percise post processing when it comes to close up face shots.
Take for example the bride with the veil. The detail in the veil is amazing but this same crisp detail brings out the flaws in the bride's skin, and I can see it bringing out flaws in makeup as well. I have had to deal with flaws in makeup with my little 12MP D2X. On the below print you cannot really see the contour of the blemishes under the makeup but in the full size print, it is pretty glaring. Of course in a lessor MP camera, these flaws are somewhat diffused when increasing the size of a print but when you already start out with a native resolution as high as D800 file, then you don't really benefit the subtle softness that comes with upsizing.
Now this brings up yet another challenge. I suspect post processing will take more skill as well when it comes to retouching. Where flaws in retouching may be diffused when upsizing a print, when the file is already as big as the 36MP file, then any flaws in post processing will be more apparent. Also, overprocessing will be more noticeable.
In summary, the fantastic detail that all are amazed over that is in these 36MP files can be a blessing and a curse depending on what you are shooting. This is not to diss the D800 in any way. This is not some lame justification why I will not buy the D800 because I do plan to buy it.
The purpose of this post is to point out something I haven't seen posted in the gazillion of posts but then again, I haven't really read most of them that closely. This just popped out at me looking at actual prints made by these files. If this aspect has already been beaten to death, then my apologies.