I've seen 4K monitors in person. Disabling anti-aliasing (with full hinting enabled) on a 1080p monitor increases text sharpness to equal that of anti-aliased text on a 4K monitor. The only drawback is that the font no longer approximates the shape of printed text. This doesn't matter except in the outlier cases of Chinese and Japanese, which use some extremely visually intricate characters.
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I've seen 4K monitors in person. Disabling anti-aliasing (with full hinting enabled) on a 1080p monitor increases text sharpness to equal that of anti-aliased text on a 4K monitor. The only drawback is that the font no longer approximates the shape of printed text. This doesn't matter except in the outlier cases of Chinese and Japanese, which use some extremely visually intricate characters.