With the difference that none of the others possess the concept of "Ki", but only magic power, whatever saitama has, ghoul cells and whatever is used to measure strength in the world of Nanatsu no taizai
Everyone has ki. Mana is simply how much or how powerful magic you have. Ki is the person's life force also translated as breath. Even in a mana based anime, they would posses ki. Black Clover is an example. Asta isn't able to feel mana, so he uses ki to find/sense opponents.