>>I'll also try fine tuning my lenses. > >I wouldn't recommend this procedure until you've eliminated >the other possibilities that have been mentioned.AF Fine Tune >can be a useful feature, but it needs to be applied with care. > If you do want to try it, there have been many discussions on >the methodology in this Forum over the past few months
I absolutely agree with the "with care", but I think given the higher expectations people have with the camera, that it does benefit one to do the fine tune pro-actively. My D800 went through a repair and calibration by Nikon, and it still has adjustments ranging from 0 to 12, and that 12 really does show a lot of difference versus 0 (example focus shown, enlarged).
I do agree if one is happy stay happy. But if you start feeling you are not getting what you expect, I would suggest read up carefully on both technique and pros and cons of how you test, realize it is VERY easy to screw it up, realize someone will TELL You that you screwed it up no matter what you try. But I think it is worthwhile if you have questions.
Incidentally I put up the D4 results so this doesn't turn into a "The D800 is bad" discussion. I just think as we all get more into "high scrutiny" photography, this is a real component of it.