>Correct me if I'm wrong, what I'm taking from your comments, >is if I have been satisfied with the results of my previous >cameras at f16-f22, then I should not be overly concerned with >my D800. I should be just as happy or more so with the results >of my new D800. By the way the wide angle lens I have been >using is the Nikon 16-35 f4.0.
I am not an expert but that is my take on both the physics and some early testing.
One caveat: when you are in a post processing program now, and look at a 1:1, bear in mind it's a very different 1:1 image than before. I think that's what is throwing a lot of people. Everywhere you see "this is a 100% crop", what they are saying is "this is X pixels". With twice the pixels for a given part of an image in each direction (+/-) this means in effect you are seeing a 2x magnification relative to a 1:1 image with your prior camera.
What's more meaningful is to take the same percentage of the frame. So on a D700 if you look at a quarter frame as a crop, and do the same on the D800, I think you will find at all F stops the D800 has the same or more detail.
Now Sharpness is something I have not experimented with, or more specifically the edge contrast added when you sharpen in post processing. Because you have more pixels, your edge is different, and I do not know whether for a specific type and amount of sharpening you will get the same result. One habit I will need to consider is that to sharpen I usually go to 200% and make it "a bit crunchy". Now that 200% is different. Experimentation needed.