The first one is really obvious, but the second one looks extremely close to photorealistic. It looks like the lighting technique turned out a bit grainy? But if I didn't know it were a render, I'd mistake that for just a grainy photograph.

fake e: it's the windows that give it away in the second photo. Damn. Still waiting for a truly photorealistic render. Looks like we're close.
fake ee: still waiting to see one- it may be out there, but all the renders I've seen have something in them somewhere that give them away, be it even a tiny detail in the reflection.