Strengh controls how much sharpness is applied to the pixel data:
Soft controls the edge grays gradation.
Soft Edge acts on the non sharpened edges. If Sharpen strenght is set to 100, Soft will apper to do nothing, Soft Edge is more designed to fine tune the amount of transparent pixels. The difference with Strenght is that, Strenght clips to black from opacity and Softness clips to transparent pixels from alpha value.
Default behavior: Strengh 100%, soft 0 (this is the old behaviour)
- original writeup
With old sharpness you can only adjust threshold manually via slider in the setting, Strength doesn't seems to do anything.
With new sharpness you can use sensors to dynamically change threshold, plus you can check "soft mode" and you can set "soft edge" to get more soft edges (see pic).