That is not the case for the toy on your picture
A cap has a impedance that is the combination of the resistance and reactance. The resistance is the real part, the reactance the imaginary part
The real part is also know as ESR and the ratio of the real and imaginaire part is the dissipation factor (DF). You can recalculate that to the loss angle (tan d) and the tangens from that is the DF (also known as D or 1/Q)
So all are related. Leakage is given as a parameter in the datasheets.
Besides a high ESR, to low capacitance, leakage, there are more defects like cathode rupture and dielectric absorption.
Most defects are related to the oxide layer. That is the DC barrier and the source of the capacitance. Most defects are oxidelayer related.