Ms. Kare said that she had even become confused herself, once picking up a Samsung phone off a table full of devices at one of the lawyer's offices when she wanted to make a point about the iPhone.
Still, the differences are as minimal in person as they are on paper -- while the Series 9 does seem slightly thicker in hand, it's really not a difference you'd notice everyday, and just like the Air, picking it up off your lap or table requires little to no muscle.