I think AMD's still better, but the gap is a lot smaller than it used to be. For instance my 660 Ti's 230ish khash puts in it in Radeon 7790, or 6850 territory. Both cards are usually cheaper than a 660Ti and they draw less power. That claim on 650 kHash from a 780Ti puts that card very close to a 7950. However, again the 7950 can be had for less, and it draws less power.
Theoretically, I think the R9 still has the advantage even with the price differential. However, all of this is prototype code (I'm talking about both the AMD and the nVidia miners here), so more software optimization or driver updates on either end would blow the gates wide open.