I took a pic with a 7+ in Target the other day. Just down an isle in electronics. Nice, crisp, and bright. Took same pic with my 6s+ and it got darker the further down the isle you looked. No special adjustments on either iPhone.
I had a 7+ 256gb on order. But, some medical issues had me cancel. May reorder as getting better. The dual speakers in a more quiet environment than Best Buy was very good.
For me the camera and dual speakers may be worth it.