Nikon D600 gold award

Not sure what you're looking at but say ISO 6400 from the A99 looks less noisy than ISO 12800 fromthe D600 and a bit more noisy than ISO 6400 from the D600.

Based on the shutterspeeds you could assume that the A99 received 1/3 of a stop more light, but Dpreview state that the lightsource can vary too. Which in effect means that we don't know much based on this test alone.