it is astoundingly impressive, same 28nm node and a single card manage to match 7950 crossfire. I stated a 290x OC would came close to 7990 performance and that is amazing value.
with mantle and bf4 I dont find any reason why someone would buy a 780/780ti etc..especially if their main gaming is BF4 and other frostbite 3 games no matter if there is pricecuts or not from nvidia.
Be interesting to see how it compares in games. I reckon the 290X might fall a bit further behind in games vs my stock 7950 crossfire setup but it will be interesting to compare.