Most accurate depiction of cortical homunculus?
Be sure to distinguish exactly what the diagram is showing. Your first reference is sensory cortex mapping. The second reference is motor cortex mapping. The text of the second reference is admittedly confusing about this, a search for "Wilder Penfield motor cortex" verifies.

It seems reasonable the feet would show sensory response similar to the hands. Stepping on a nail is just about as bad as bumping your hand into one. Motor control is different. Muscles are not all innervated the same. In some of the large muscles, say in the legs, one nerve can control hundreds of cells. In other cases, particularily in the face, one neuron might control only six muscle cells. Thus a greater number of neurons, and a larger portion of the brain, is needed for control in these delicately controlled areas. It would make sense a greater part of our brain would be needed for motor control in our hands versus our feet.