If you're asking about my personal preference, the FXD80 is not really my signature. It's too withdrawn in the lower midrange and not warm enough tonally. If I listened to more EDM type music it might be my favorite as it's really good for that, but I'd personally rather listen to a VSonic VSD3S, UE600, Ostry KC06, Sony MH1C, etc.
The sound signatures are somewhat different - the SE215 is quite smooth and not THAT bassy whereas the MA750 is more v-shaped with somewhat laid-back mids and a little more upper midrange/lower treble presence. In order to call something a straight shot from the SE215 it would have to have the same sound sig.