I would have to say selective focus, being a photographer, i love taking photos, but to always have a bulky camera for simple photos is an annoyance, and not currently having a good enough phone to be satisfied with the camera on it isn't great, with the samsung galaxy s6 edge, i could not only take great photos on the fly, but also be able to take great video and capture some great memories with ease.
also the 4K video looks AMAZING!!!
Good luck to everyone, and congratz to whoever wins