The first is really good, and I totally believe he did it as an original work, but those people on that site have to morons if they believe he did it that fast in real time. It was done and then they time elapsed it for effect. Also, he is using photoshop, I recongnized the brush palette that popped up every now and then. Either way that guy has some real talent and a real eye for all those details.
Second one looks real as well. You wouldn't see all those toolbars popping up if it wasn't real. Also, notice the palette that he made himself for color reference. He also has talent, I'd say it's a close one between the two.
-Magnum