Also, while the CPU instruction sets are not exactly equal, the same is true for Intel processors of different generations too. And it doesn't matter one bit... Unless there is a bug in CPU you will never notice the difference, because it is taken care of at the compiler / kernel level.
Intel does have some advantages (and disadvantages too) over AMD, just not those.
If we are talking about 3D-Now, that is long dead and buried. If we are talking about the latest AVX-whatever, not even Intel is consistent, with different processor families supporting different subsets and applying different clock policies.
Yes it was Intel's own spec, so of course they're gonna implement it first, but that's exactly what I mean. This is a recurring dance, and I'll pay a little more for the one that sets the standard. If this weren't a thing, they'd both just be commodity.