  This comment is to show that our simulation data, based on our theory and
method in Ref. [J. Phys. B 41, 055401 (2008)], are also in agreement with the
experimental data presented for $D_{p}-D_{s}$ in Ref. [Phys. Rev. Lett.
\textbf{109}, 213901 (2012)]. We also demonstrate how to show the effect of
spatial coherence on the GH shifts in this comment, therefore we disagree with
the claims in Ref. [Phys. Rev. Lett. \textbf{109}, 213901 (2012)].
