Charlie Sorrel puts up a good one for the camera in the iPhone 6. The regular camera he uses? The Fujifilm X100S. Most amazingly, iPhone 6 jpegs hold up very well to post-processing.
“The JPGs from both cameras take this abuse rather well. Even zoomed in to 100%, and with the red and orange sliders slammed all the way over to the right, there are no troublesome artifacts.”
The entire article is worth a read.