Thats tough cuz the FXZ200 is so unique for an iem, and comparing IEMs with fullsized cans is not really fair, but...
The soundstage is a little smaller than the M100 but presentation is much nicer. People keep mentioning it but the FXZ200 really do sound like mini 2.1 system in your ears. The bass is so powerful and extends crazy deep. Deeper than M100 for sure. Impact is less on the FXZ200 but not by a lot, and that's because the bass is polite to the rest of the spectrum. Highs roll off similarly to the M100 but the M100 has better detail in the highs. Mids are not laidback. Not forward either. Hard for me to explain, but the strong bass doesn't recess the mids or highs whatsoever. I think it has to do with the dedicated subwoofer driver, but its actually really amazing.
I haven't had enough time with the 200s yet Nor are they fully burnt in. so ill come back for a more detailed comparison
i really want to try the 200'son my E11, they are next on my list if the m100's dont workout. Please come back for another comparision when you get a chance
In all honesty the pioneers was a good overall sounding headphone i wash i had the ability to listen to then with an amp before i returned them.hopefully my m100's will satisfy my lol