The difference is like night and day. The 7+ crushes the 6S+ in actually every single regard (except that 3,5 jack).
Honestly, I really can't understand how someone spends more than 500-600 bucks on an outdated device...
Not sure what you see, but sounds like one of us need to see a doctor to have check the vision. I quess it might be me because already have a glasses...
There is a vid compairing photos
And i really dont see huge differences - if almost any. *booking an appointment*