Actually, I just checked and KUIU sells a Superdown Pro that appears to be heavier (more insulated) than their original Superdown jacket. It probably wouldn't challenge the Feathered Friends jackets for warmth but should be pretty warm for a 1 pound jacket.
Also, this is obvious but I like to wear the insulation under my shell. With down, I think it compresses the insulation and makes it less warm. I imagine wearing it over a soft shell would be warmer than wearing it under.
