  We establish a Kantorovich duality for the pseudometric $\mathcal{E}_\hbar$
introduced in [F. Golse, T. Paul, Arch. Rational Mech. Anal. 223 (2017),
57--94], obtained from the usual Monge-Kantorovich distance $d_{MK,2}$ between
classical densities by quantization of one of the two densities involved. We
show several type of inequalities comparing $d_{MK,2}$, $\mathcal{E}_\hbar$ and
$MK_\hbar$, a full quantum analogue of $d_{MK,2}$ introduced in [F. Golse, C.
Mouhot, T. Paul, Commun. Math. Phys. 343 (2016), 165--205], including an up to
$\hbar$ triangle inequality for $MK_\hbar$. Finally, we show that, when nice
optimal Kantorovich potentials exist for $\mathcal{E}_\hbar$, optimal couplings
induce classical/quantum optimal transports and the potentials are linked by a
semiquantum Legendre type transform.
