I couldn't get any info on the down weight from PHD. I couldn't find anything on the internet about it.
So maybe it is better, maybe not. But when I contacted PHD they said it was a design secret. Well FF is really forthright with the down weight and in the end, that really gave me confidence in their products. Especially because I couldn't find any other jacket with more down weight at the same quality as FF anywhere.
The numerous good reviews sealed the deal. Compared to my Himalayan, that is already top of the line in terms of warmth, the FF is much loftier. It makes the North face feel like a t-shirt. Ok, I'm over exagerating, but you can look at the pic I posted and you'll see just how puffy the Rock&Ice is.
If you need a size large, ask about the last year models. They gave me a good discount. Good luck.