OK an update for anyone interested.
I feel as if the HE1000 are just in front now which is a shame considering they are double the outlay

I do feel though that I may not be comparing like with like as I am using Balanced mode with the HE1000 and standard with the HD800, but these are demo sets so i cant change that and I have to make my decision based on what I have in front of me.
I prefer the look, build and fit of the HD800, so so comfortable, and a soundstage and detail that I just didnt think was possible from a headphone set up. But I still find them a tad bright. I think if I was a classical music listened the HD800 would be awesome.
For me right now the HE1000 are the more enjoyable listen, they seem to have everything the HD800 has but without the brightness. They probably do lose a bit of soundstage and detail to my ears but not enough to make a huge difference. On the HD800 some female vocals just have a hiss to them if that makes sense o
I feel that the HE1000 may be a bit of a better all rounder .....for me anyway. I do listen to a lot of different genres, Classical and Jazz the only two i dont, although some of the female vocalists I listen to could be classed as Jazz maybe.
Last night Foals, Led Zeppelin, Royal Blood - better on the HE1000
Lana Del Ray - better on the HD800.
Although I am 52 I still love Dance music and buy a lot of it Hed Kandi etc, and again it seems more bass on the HE1000.
Today I will do further listening, its fun and I am thoroughly enjoying it........trouble is I have to make a decision soon