While this is true for a few of the companies, it is not true for all of them. "Korean monitors" isn't one entity. There's a lot of companies selling these things, and a lot of them are A quality panels. (So the lesson is to not just repeat things you hear without finding a primary source first).
I believe most rumors point to Apple releasing a 27 or 30 inch super resolution display within the next year. I'll be waiting for these Korean companies to release their own version and then snatch it up for a cheap price.