i have the meizu m6 as well and if you mean by cold, just a more linear sound then yes, it is more linear. the cowon seems to artificially sweeten up the mids. i have the d2, so i am not sure how it compares to the iaudio 7 but it has artificial sweetener there in themids. the meizu seemed to have a more honest bass sound without elevated mids. the warmth that you may experience with the d2 may be an elevated lower mids. overall, the d2 sounds much like a player made to sound good portably while the meizu m6 sounds good as a hifi would.
it also has a 'powerful' amp but it is only a hair more powerful than the ipod amplifier or many other hd based amps at 30mw x2. even at that, 16ohm driven, it often has trouble driving phones. I will admit that is is excellent for higher ohm and lower sensitivity headphones where the extra 6mw per channel do some good.
all this said, i would love to hear the iaudio 7 as some say it is better than the d2 and some say it is worse. i would hope that with all the positives on THIS site about it, that it is better.