I'd be willing to bet hundreds of thousands, if not all the Ones have a visible digitizer (diagonal lines). But I'd bet only a small fraction of people notice it, a small fraction of those know what it is, and a smaller fraction yet actually are bothered by it...and most of those fractions of fractions of fractions are yes, on the forums....but a whole lot more are affected, they just don't notice...or don't care.
3 of 3 have dead pixels. 4 of 4 I can see diagonal lines (shows up on light colors easier). Threads on here about mic failure, my friends mic went out last week.
In fact, just about every HTC phone I've used in the last few years has had dead pixels. While I understand this is a LCD manufacturer issue, QC could control that and HTC could choose a different supplier.
For a long long time HTC has been my favorite, because they use good looking LCD's, the EVO LTE/One X looks fine, but I can see the digitizer (diagonal lines) on the HTC One, as well as the DNA before it.