The intel's architecture of processor is considered as the world's most refined mean. Just take an example of 'sandybridge' CPU, i7 2600k is the fastest processor in the world today, the i7 980x (990x for now) has an old architecture named 'Nehalem', at time considered the fastest has now been beaten into dust by the 2600k. Before that, older i7 processors were outperformed by Nehalem, as we can say that, in the case of intel we have seen consistent improvement in performance with the change of architectural design, like Bloomfield < Nehalem < sandybridge.
But in the case of AMD, the performance improvement was inconsistent. eg: AMD Phenom II x6 1090 T black edition is slower than AMD Phenom II x4 965 BE. The technology and architecture which AMD used was not up the par. Like 10mm and 10.00000000000000001 mm have the difference of 0.00000000000000001 mm which AMD considered as 10 mm and used the same measurments for their processors.
The intel is the sign of perfection but AMD is not. I doubt the success of bulldozer. The SB may beat it in dust