I own a 680m and I can tell you it kicks butt, The 770 has a 192bit interface vs the 256bit of the 680m.
When I overclock my gtx680m to 854mhz gpu and 2200mhz memory I get around 6900 plus 3dmark 11 at 720p.
The 770 scores around 5180dmark which is good considering that when not overclocked the...