Yeah, the foliage has always been that kinda whitish-grey-blue-green. I don't think it's washed out,that's just how it grows.
From pictures and descriptions floating around, I have always tended to lean towards the curtsii direction, even though it was sold to me as a superbiens. But then, descriptions of what actually is different between the two are so vague that it's hard to tell. I'm with Guldal that it probably takes a pro taxonomist and careful examination to say for sure.
...but then... if they are that close... maybe they should just be collapsed into one, highly variable, species.