Looks like my D800 has the left AF problem :(

I did some testing tonight, posted my full results here: http://photokaz.com/2012/07/nikon-d800-contrast-and-phase-detect-autofocus-testing/

The 24-70 shows it a lot more than the 50, but it's visible in both. Looks like I will be sending my expensive new cam to Nikon to get fixed, I hope they can turn it around quickly.

Summary table below. Note the bottom left of the chart showing the poor performance of the left AF sensors.