Yes, and yes. The only noticeable difference is that there's no carbon in the derailleurs or cranks, most of the parts are all silver alu. I have an all alu Athena group from 2 years ago, but I think Athena has a carbon crank arm option this year. Athena preforms just like Campy should,,, Sweet!
... Yes they do, just checked it.
I think lever ergonomics of each should be the determining factor. If ya like the new shape Campagnolo, go that way, if 6700, that way. If it's a wash I would say Campagnolo. Better BB/crank. More functional levers in terms of RH(rear) cog selection number and LH(front) in terms of FD fine adjustment.
Cogset ratio is great with Campagnolo if you want a 12-29..shimano has a 11-28(no 12-27 this year altho a 6600 12-27 will work fine).
Like Velonews mentioned, Campagnolo is elegant, very functional, a joy to ride. 6700 is a workhorse, reliable, great brakes and FD...both are great, both better than sram of any kind(IMO)..I like the elegance and comfort of Campagnolo.