Red Giant "Looks" is a plugin that helps to get results like that in post. It has an mighty arsenal of diffusing filters.
Or you could try to emulate that look in After Effects by softening the highlights and/or shadows via a luma-matte. One very easy way: Duplicate the footage, tint the duplicate b/w (maybe soften it a bit) and use that duplicate als a luma matte for an adjustment layer with a softening filter of choice.
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