Actually, the large majority of digital projectors used in theaters are 2k.
Wait, did you read what I linked, or did you read the previous article written by that same author?
I know that you're an industry professional trained to photograph/edit/process imagery, and that you are a person who works frequently with hi-def imagery, and have trained your eyes to pick out details others would miss, to notice how light plays across an image the way others wouldn't even think to see, to discern minute differences in contrast, color, tone, hue, gradations and the like. You sit really close to monitors for extended periods of time a day, you study images non-stop, pictures are constantly flying past your face at high resolutions, in great detail, and this is what you do not just for fun, but for a living.
You are in a really, really small minority of people with the ability/skillset to even know WHAT to look for, much less the acuity to spot it when you see it. It's a pretty specialized gift you have, yes? Not everyone has that. In fact, the majority of people who consume visual media don't. A LARGE majority. An even larger majority don't watch 42" displays from 3 feet away while editing Hi-Def video all day. They watch it from 8-10ft away on that same 42" display.