Yeah but when you're slogging for an LCC or short haul doing a ton of sectors they're generally in the same time zone and you're back in your own bed (even if it is min rest) Ultra long haul can't be compared to that.
I've flown extremely short haul (2-7 sectors in a day, repeatedly), medium haul and EK rosters. EK rosters are like nothing else, it's a whole different kind of "tired"