It's plus 0.3 to 0.5 millimeters to each dimension. The diameter of human hair is about 0.05 to 0.1 mm.

The problem is that you're setting up a bit of a reverse Zeno's paradox. Every iteration gets the "oh, it's hardly noticeable", but at some point it will be. I already find the iPhone 8 to be larger than I'd like, but I've come to terms with the size. The X was noticeably larger than that to me, but I realized that I was going to deal with it. And now it's even larger.

The iPhone X, XS, and 11 Pro are all the same size. They rebranded the awkward middle size from XR to just 11.

Or at least almost the same size. It looks like the 11 Pro is slightly larger than the X, although thanks for pointing this out as I would not have otherwise guessed that.