Q:

Taking multiplicities into account when counting the elements of a list

Say we have a list 
l = {4x,3y,z}
When we do 
Count[l,x]
we get, as expected 

0

Is there a function, call it F, that takes multiplicities into account, so for example for l
F@l

{4,3,1}

or equivalently a function that extracts multiplicities of each element in a list?  

A:

You could use FactorTermsList:
First @* FactorTermsList /@ {4 x, 3 y, z}

{4, 3, 1}

