Micro-contrast and sharpness are related, but they are not exactly the same.

Micro-contrast generally refers to a lens’s ability to render very small differences in tone or color between adjacent areas. Sharpness is more about how clearly edges and fine detail are resolved. In practice, a lens can appear very sharp because it cleanly defines boundaries, while micro-contrast helps give subtle textures and tonal separation more presence.

That’s why some lenses are said to have a “3D” look: strong local tonal separation can make subjects appear more distinct from their surroundings. This is often discussed as a particular optical character of the lens.

Software sharpening can increase the appearance of sharpness by boosting edge contrast, but it is not exactly the same as the native optical rendering of fine tonal differences from the lens itself. So while editing can imitate some of the effect, micro-contrast is usually described as an inherent lens property that contributes to the overall impression of image clarity.