quite funny as i could not sleep tonight, so i decided to do a A/B comparison between ie80 and mh1. and guess what!? the mh1 easily plays all the way down to about 22-25hz. the ie80 starts playing at 32! as for quantity the mh1 has about the quantity in sub bass, that the ie80 has at about half opened bass screw but without bloating in the upper bass registers. another thing i registered is that the mh1 has better soundstage depth but is a tiny tad smaller in width. mids, separation and highs are on a similiar level to my ears. so we have a clear winner. mh1 is also more comfortable to my ears.
I thought the IE80 had the wider soundstage of the two. However at stock, the MH1C has much nicer and cleaner bass. I've modded my IE80 and it now sound much nicer in all areas, although the mid bass is reduced further.