Dear Lazyweb, is a 5K monitor a waste of money?

Is there any chance that I will be able to perceive the difference between 27" 5K and 27" 4K running at the same apparent resolution?

One uses retina 2x pixel scaling, and the other uses 1.5x, and is almost a thousand dollars cheaper.

I do not have microscopic vision. I use this monitor at my desk, sometimes for editing photos and videos but never for watching movies or playing games -- I have a 1080p projector for that.

Previously, previously.