I personally haven't listened to the Q701 in detail before, but from what I've read, it does seem to be a better choice if you're going the safe route.
I've been overlaying the Olive-Harman preferred headphone sound and traditional flat-speaker HRTF onto Tyll's measurements on Innerfidelity. Of course, the frequency response doesn't tell the whole story, but I was surprised to see how the K 701 and Q 701 fair in terms of the entire Q/K 6/7/8/X-series headphones that have been measured. I certainly won't be paying nobody's ~$1100 for the K812.... D:
Black = Harman target headphone response
Green = flat-speaker HRTF Q and K 6/7/8/X-series measurements (Click to show)
And since it's on-topic right now, here's the Beyer DT880 measurements DT880 measurements (Click to show)
Head-Fi'ers like MiceBlue, are the reason Head-Fi is such a great online community.
Absolutely excellent post.