When I posted this question it was purely out of interest and to see if others shared my opinion that this was perhaps sales hype to encourage me to spend more than I need to achieve my goals. What I received back from Nikonians was a great amount of most useful information that has been added to my knowledge of phpotography.
The ideas of lenses used with a D800 and your experiences of them are great for allowing me to focus on my needs going forward. I will certainly be looking up the lens data tables, but more importantly I will be giving greater thought to the areas of photography I wish to concentrate upon. That is where I believe I should spend the real money aquiring the best lens I can for that subject area. I can perhaps spend less on lenses to shoot subjects I encounter less frequently and here also the second hand market may come up trumps.
From all the comments received the key lesson for me is "a bad workman blames his tools" and what I must concentrate on is technique - practicing over and over. I have found my D800 invaluable in this respect, rewarding me when I get things right (but always room for improvement)and hitting me hard when I forget elements or have not concentrated on the shot. It also offers me so much flexibility and something new to learn all the time.
Sharpness isn't everything I know, and I will not be printing too many huge images, but why is it I get a real buzz when I do get that sharpness spot on!
I shall take away your kind comments and advice, make an investment in one new lens in the short term and hopefully share the results with you all in the near future.