  A recent work (2014 New J. Phys. 16 013006) claims that nonmonotonic
structures found in the many-particle quantum-to-classical transition (2013
Proc. Natl Acad. Sci. USA 110 1227-1231; 2011 Phys. Rev. A 83 062111) are not
exclusive to the many-body domain, but they also appear for single-photon as
well as for semi-classical systems. We show that these situations, however, do
not incorporate any quantum-to-classical transition, which makes the claims
unsustainable.
