A wf easily reaches 85% healing. I've seen far more non-wfs die than wfs in all my 1000 shroud runs. It's all up to player skill and build.
And pure wf figther in the current content reaches 450-500 hp, close to twf barbarians. Throw in dod and 100% healing from arcanes and you've got more survivability.
Really, what kills the wfs is the ****-ass clerics refusing to heal them for gods know what reasons. A heal is still a full hp heal.