Classifying stuff as either UL or SUL is tough, as there are many ways to SUL. My personally view is to have a good chance at hitting SUL you're limited to about 1 lbs for a shelter, so the Skyscape X would qualify. I really like the look of the Skyscape X.
My personal weight goals for reaching SUL are roughly:
Sleeping Quilt: 16oz
Non-worn Clothes: 16oz
Sleeping Pad: 9oz
Cooking / Eating: 6oz
That leaves 12oz for hygiene, first aid, headlamp, water treatment, camera etc. This would vary by where you hike and the weather forecast though. In many areas (ie. utah) you could get away with much less than 16oz of clothing in the summer. I did 2 days in Utah recently and it was so warm and dry that in 48 hours I never put on anything besides a t-shirt.....even in the evenings hanging around camp.
Some areas are easier to shave weight in than others, if I had to go SUL (I'm currently at ~6.25 lbs), I'd probably leave the cookset at home and eat cold food so I could put a little more weight into my shelter, sleeping pad and quilt.