Its possible. It suppose to have the same wolfson as the samsung galaxy so it is a good one. But probably LG mess up the design with bad layout and cheap components for the headphone out.
ES5 is not easy to drive (if you want to really achieve what it can do). It has 5 BA which mean 5 frequency dependent impedance, so if the source mess up the output impedance (= too low output current) it messes up the freq response.