Smart Fill technology

is f-ing incredible these days. Ok, filling in some sky or sand, no big deal. Covering up the time stamp on a photo, pretty impressive when the background's complicated. But filling in a big chunk of mountain? Wow.

Shrunk subsets of smart filled and original images (and this is without even tweaking the settings for optimal performance). Can you tell how much is artificial before looking at the original?
http://members.shaw.ca/sacrawfo/Pano_3_smartfilled_subset.jpg
http://members.shaw.ca/sacrawfo/Pano_3_subset.jpg