According to a private seller of K702s on Ebay, his newly acquired Q701s in comparison to the K702s are:
"...greater refinement & control in all the hi-fi areas, treble, bass,seperation etc....the K702s sound a bit more ragged by comparision at the extremes. In presentation the K702 is tuned as a studio monitor, so has "larger" vocals and is more critical of older sources (50s mono jazz for example) The Q701s are tuned as a hi end hi-fi speaker, so perhaps you could call them more musical and a bit more forgiving. They certainly take less running in than the 702s (70 hrs to 500hrs!).
so, there you have it from someone who's assessed both in detail. BTW various US Ebay resellers have the Q701s in various colours for as little as £200 equivalent including shipping, though you have to allow for the onerous HMRC/Royal Mail charges of around 27% on top of that. Still, makes that comment from Home CinemaCentre (UK) above: "... £360... grab a bargain now" look rather hollow. I think I'll pass on that!