All of us seem to have anecdotal evidence of focus problems. Mine is that all of my lenses work well with my D700 with no AF finetuning - but I usually don't want the most shallow depth-of-field obtainable. If I did I might need to use some AF finetuning with the D700.
However, my new D800 was backfocusing consistently, even at f/3.2 or so. Because of that, I used FoCal to do AF finetuning on all my lenses with the D800. Now it gives the very sharp subjects that I expected from this phenomenal camera!
I have not checked to see if I get consistent focusing across all 51 sensors. If I get some spare time I will look at that this weekend with one or two lenses.
btw - I do portraits, some sports, and action horse shots. As a general rule, I use single-point focus, the "focus on" button to focus, and AF-C whether I am shooting action or portraits.