The iPhone 6s plus carries over the same design as its previous iteration. But look deeper inside, everything else is changed. It packs a much better processor, has twice the amount of ram and has a new camera, has tge new 3d touch technology, touch id 2.0, a new colour rose gold. But on the paper the camera lookes vastly improved but in real life the results are pretty familier. It packs a much better battery than the 6s, has a full hd screen, has OIS and packs some extra tweaks in the IOS 9. So it id a worthy upgrade if you are a user of iPhone 5s or older. But if you are a 6 plus user there is no point in upgrading.