Looks like stock vs stock, the GTX 680 eeks out small wins on regular titles and wins more on TWIMTBP titles. 7970 has huge headroom so it'll be interesting to see how the GTX 680 does when both are overclocked. The most interesting graph to me was power draw. Both are probably priced beyond what I'm willing to pay, though, as 28nm price/perf fails to impress me so far.
Edit to add: I wish we saw more about NVDA power boost in action, where they go up to TDP or even a bit beyond, at times of peak stress. The most interesting graphs may be minimum vs. minimum framerates, not average vs. average.