I do not use anything from this all.
3D Touch is convenient, but somehow it has not become a habit for me, you can do without it. Live Photo was played continuously for the first week, yes, it's cool, but again, you can live without them. Siri was rarely used on all devices, and then, basically, I only ask for the weather. Improvements to the camera are not very noticeable, I mostly photograph the text and some moments on the fly, so 8MP was enough for me. And here is the new color of the case - nya nya nya, and you can immediately see that 6S, not 6ka :)
When the seven comes out, I'll buy it right away.