I too am surprised to hear the Quad characterized as "rock speakers" since they are a bit removed from this. While pretty decent with rock, they excel at Classical and perhaps even jazz and make excellent partners for tube amps. When I first heard it 2 years ago it was partnered with a restored Quad tube amp (that could go for about 5-6 lakhs) and it is one of my more memorable listening experiences. Bit smooth for rock but definitely has the bass extension necessary to work well without a sub. I have not heard the new range either but do not think there will be stark differences as there are no major design changes. Hope they have retained that superb lacquer finish that made the older one look so classy!
I do not think it should be compared to B&W 684 at all. That is B&W's next-to-entry-level series and it gets better only from 700 series and up. But yes, price-wise in India it seems much costlier due to mark-ups.
If you are in Mumbai, I would suggest listening to Totem speakers at LaKozy at Chowpatty as well (do not know if they are in the showroom, I had heard them at Boom-a-rang at Juhu). They excel especially at percussion and are a pleasure to listen to Jazz on - perhaps it would do well with Classical or Fusion as well.