I think it's important to consider the balance between display size and resolution.
1080p for displays within 24 inches. For 4k, I feel that a display with at least 30 inches or more is optimal. The one that feels well balanced is the 2k 27 inches. It can be used without adjusting the font size. However, with the spread of 4k products, it seems that the number of 2k display types is decreasing.