I have had the jet black for 3 weeks and man it is scratched. I had the 6 plus in space gray, the 6s plus in rose gold and neither had any visible scratches. But I do love the feeling of jet black compared to the regular finish, which would always slide off my hands.
https://imgur.com/gallery/yP8Zf Here is some pictures of my 3 week no case jet black!
Wow. I guess jet black owners have to resign themselves to having phones with next to no resale value. I sure would not want to buy anyone else's scratched-to-hell iphone.