Same here, but I would've upgraded if I could've afforded itiPhone 6 64GB, not going to upgrade to the 6S but waiting for the next generation iPhone.
I have finally moved from an iPhone 4 - 16gb, which served me so well for these past 4 years, to an iPhone 6S - 64gb - the change is incredible.
I just upgraded for the first time in four years, too, but from a 4S to a 6s, and I'm still a little tempted to go on to the 6s Plus. I've got about four days to decide.
It would be interesting to compare these results against a segment of average iPhone users.
I imagine those who actively use these forums would be more likely to have the latest iteration.