See that's the thing, it's subjective, and there's no way to definitively test something that's subjective, annnnnd I'm tip deep in dynamis right now, so will look over that later.
Everything in life is subjective seeing as you're the only one who can tell you what you sense.
The best analogy I can come up with for my preference in audio equipment is this. Some people prefer Chevy to Ford, some people prefer luxury cars to sports cars.
I feel that I can honestly tell the difference between my headphones, amps, tubes, etc and have stumbled on a combo I am currently happy with. While the majority of people tend to like a brighter sound from testing (still searching, can't remember what the damned article was called and my google-fu is failing... about to have to click through head-fi to find it), only you can say what you enjoy or not.
Meh, if you're happy with the headphones that came with your phone then that's you. I try not to knock what people enjoy (until they claim that their $10 headphones are equal/better than mine without ever listening to my set up).