maybe it was the combination of hangover and sciatica but it felt to me tougher than Tankys. It can't be though: the terrain in general is far less difficult and boggy for a start.
My PB is 35 minutes slower on the ES. I hope to rectify that this year though.
There is more time spent at altitude on the Skyline and you tend to spend half the race running into the wind where on TT it tends to be more across you.