I have read a lot about lens softness
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Lenses all have a distinct character. Even among different example of the same lens there can be differences. Softness/sharpness is just one characteristic that lenses specifically exhibit. It is also often true that people mistake smoothness (of tonal transition) for softness.
Anyway, the above posters are correct. Once an image is actually created "soft", it can only be made to appear sharper. Sharpening puts new artifacts, edges, on your image. These edges emphasize the appearance of detail but do not actually add detail, unless you count the edge artifacts as detail.
There is no substitute for great lenses. If you make an image with a great lens and you want to degrade it in Post Processing to create the effect you want you can easily do this. However, when you make images with bad lenses and later want to enhance them in Post, your job is not so easy and the effect is usually not as satisfying.
Peace and Happy New Year to all.