I've been using my iPhone more and more but still pack a DSLR and gear on trips.

Mostly like the ease of use for specialty shots, like panos, time-lapse, some slow-mo videos.

I even upgraded from the 6 Plus to the 6S Plus just because of higher pixels on the panos, OIS on the time lapse and slow-mo video.

I've not recorded any 4K video because I don't have a 4K TV or a 5K iMac yet.

I do take overlapping shots with my Nikon D750, so that I can stitch them up later if needed. But generally find that I like the panos I get out of the iPhone and really like the time-lapse results too.

Rumors are that iPhone 7 may have dual rear cameras, complemented with more image processing to combine the dual camera images.