In my experience the first month after a release is where I used to see the flurry of people upgrading. When the iPhone 6 came out my office was full of them and people actually discussed it. Probably because it was the first big iPhone. I didn’t see much of a buzz last year with the 7 and this year is perhaps more muted again. Since the size increase I think people are perhaps keeping phones longer. I think i’ll see a few more 8’s around the office over the next 6 months rather than the X. It reminds me of the Apple Watch in that it sells well, but not everybody needs it.
The only reason I asked was because Apple sells WAAAY more iPhones in the other 11 months than they do in the first month.
It's just funny to hear "I haven't seen any iPhone X yet" when it's only been around for literally a month.