[driverdan]

Your vision may be worse than you think. It's easy to distinguish between those resolutions, especially when looking at smaller text.

[nobleach]

Hmmm, as an engineer, I have my vision checked every year. While a difference is discernible, it's not enough that I'd "miss it" if I didn't have a retina display. (I just ordered a Dell XPS 15 this weekend, I purposely left if at FHD as I didn't see the need for 4K on a laptop)