I'm on the anti-circumcision side, but I don't think that the entire intact foreskin is normally as sensitive as the circumcision scar. It seems that the nerve endings on the circumcision scar have concentrated sensitivity that is sharper than what most of the regular foreskin would be, as if some (most?) of the normal sensitivity has been condensed to that brown circle. It's possibly somewhat comparable to an intact frenulum, but I don't think you can extrapolate from the scar to the entire foreskin.