I've ended up auditioning and buying the E70.
I can't use audiophile terms (despite the fact I've been an aficionado of the industry for 35 years) so please bear with me.
I've sold my IE800 and I was trying to find a suitable replacement so this is a direct comparison. I've only spent a few hours with the E70 so I will need more time to form a better opinion and to burn them in.
My first impression is of a clear sound with sweeter trebles (best description I can find)...