  The quantification of quantum coherence has attracted a growing attention,
and based on various physical contexts, several coherence measures have been
put forward. An interesting question is whether these coherence measures give
the same ordering when they are used to quantify the coherence of quantum
states. In this paper, we consider the two well-known coherence measures, the
$l_1$ norm of coherence and the relative entropy of coherence, to show that
there are the states for which the two measures give a different ordering. Our
analysis can be extended to other coherence measures, and as an illustration of
the extension we further consider the formation of coherence to show that the
$l_1$ norm of coherence and the formation of coherence, as well as the relative
entropy of coherence and the coherence of formation, do not give the same
ordering too.
