Yeah, you can pick out a lot when staring at a still frame and comparing A to B. However, I think if you throw some AA on the latter pix and watch it in motion, most people wouldn't even notice. I'm not saying I can't see some telltale signs, but I'm just saying that fluid imagery can cover up a lot. The latter pix don't even look like a rendering at Xbox's maximum resolution (or maybe it is just the high contrast of light to dark areas of that particular scene), so that will make them look even more aliased than they "need" to be.