Do you mean to suggest that a significant percentage of Medieval peasants in fact considered Kings to not be all that different from themselves as people,

That sounds like something I'd keep to myself as a medieval peasant if I did believe it. As such it may be the sort of thing that said peasants would tend not to think.

(Who am I kidding? I'd totally say it. Then get killed. I love living in an environment where mistakes have less drastic consequences than execution. It allows for so much more learning from experience!)