OK, I had some time to do sample shots.
This is my setup.
Black seamless background. Subject is 4 feet from background. Deep Octa is approximately 45 degrees off axis, raised up, angled down with the center feathered across the subject at about 4 feet from the subject.
I've also included shots with the diffusion panels so you can see the difference between using deflectors and using diffusion material. Each configuration has it's own unique look and especially in the shadow edge and transitions between diffuse and shadow and specular (highlight) to diffuse.
Exposure is the same, metered in the exact same place, and using the same aperture so shadow depth is compared at the same depth of field.
Here are the individual shots and then a cropped comparison to show shadows and transitions. The two places that really show the nuances of shadows are the primary and secondary shadow that are coming off the nose and the shadow that crosses diagonally down the neck. I didn't do a tight comparison of the hot spot on the forehead but you'll see a similar smoothing out of the specular to the diffuse and ultimately a much more controlled highlight without the use of any other modifiers, scrims, etc.
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