I am wondering if some of the lenses would work on a D800 e.g.. Nikon 80-200 mm F4.5 or would the glass not be good enough for the camera for 36mp. ?
I suspect Nikon has never made a lens in F-mount which is sharp enough to take full advantage of the D800's sensor at all possible apertures. That doesn't mean you shouldn't use them. In fact, I see no reason not to use any lens you use on a D700 on a D800. I don't care if it's Nikon's newest and best lens or an old AI-converted 43-86mm.
Yes, when viewed on a computer screen at a 100% crop, it's quite possible that your 80-200mm f/4.5 shots from a D800 will look softer than 100% crops from your D700. But rescaled to the same resolution or for the same size print, the shot from the D800 should look at least as good and likely somewhat better.
I haven't used an 80-200mm f/4.5 in many years, but I do own an 80-200mm f/4 AI-s. By today's standards, it's not extraordinary, but in the right hands it's capable of producing great stuff.
I don't know how much I'll use the 80-200mm f/4 on a D800, but I do plan on using a 75-150mm f/3.5E for the same subjects as I've used it with film cameras in the past.
If you want to photograph a man spinning, give some thought to why he spins. Understanding for a photographer is as important as the equipment he uses. - Margaret Bourke-White