Depends on where you hit and how hard you hit, as at the moment the damage output from a bash is very inconsistent. I've had times where I put in 3-4 fully charged hits on a enemy's upper torso and have him not die (didn't have to bandage either), despite the blood that was splattering on him. Other times I'v killed people with a pistol whip on the stomach in one hit with out charging it.
are you even reading the posts?It's like this with the bayo too? I've definitely gotten some one hit bayonet kills, but often it takes a few stabs to finish the job.