I've never thought iphone camers were good, every shoot, even in bright sun looks overprocessed and just plain muddy and I've had almost every iphone since the original. Having said that, I have been shooting DSLRs for just as long so I recognize I am biased and the tiny phone camera will never compare. I havent shot with a standard point-and-shoot camera for awhile but from what I remember, I was surprised that I found the P&S quality to be of similar quality, so from that perspective, the iphone shots are pretty decent.
These are NOT posted at full resolution....the detail breaks down too quickly. She either sent them smaller, or MacRumors' site squashed them as they were posted. I know my 6 (and 5S)'s photos would have survived more than this one zoom level, so for sure a 6S would. Find a real photo test with proper uploading of full rez files and judge by that.