Well, I got your point but I think we can't simply say this headphones are neutral, this other headphones aren't neutral. I believe that comparison is more fruitful, and that is why I said "more neutral" instead of neutral.
I speak for the general consensus perceived, as I've said. But I'm really sure that some people could find HD6000 more neutral than Pro 80, because our hearing is quite complex and may differ between people. More so, recording techniques are very different from one album to another, then calling a headphone neutral is an oversimplification of the problem to me.
Quoting Tyll Hertsens (Innerfidelity): Link
"Neutral is a word we love to throw around...but none of us really know what it means with regard to headphones."