Well, back home now, so I thought it about time I really gave the MT300 a solid listen vs Sony MH1C. <gasp!>
Can the MT300 take down the latest hyped up IEM? Sadly, atomikn00b said it first: no. At least, not on sound quality.
It does not take very long to hear the MH1C really come out in the treble. Clarity is just excellent and outstandingly smooth. Like almost HF5/XBA3 good. So in that regard the MT300 just gets left in the "better than average" group. It can't tango with the big boys here. Sorry, kid.
Mids are a little tougher, because the MT300 is quite good in the mids, and it seems like the designers spent some time here getting things right. But still, the MH1C has an edge in mids/vocals, with just that extra little bit of ring.
However, I still prefer the bass of the MT300. The MH1C has a mid-bass hump which I feel is over-emphasized. While the sub-bass on both seem to be at the same level, the MH1C boosts the mid-bass while the MT300 keeps it flat, and tight, and therefore enjoyable.
Unfortunately everything else about the MH1C is terrible. The cable.. my gosh... who thought this was a good idea? It just curls and curls and curls almost comically. Then if you so much as MOVE, you hear it all through that cable. If I had a friend who didn't know what "microphonics" was, i'd send them across the room with the MH1Cs, then with the MT300s. Night and day. I could probably go on about how completely impractical the MH1Cs are but I'll stop there and say even though they sound great, mine have not seen much use. As a headset they are a failure - how can I walk down the street and carry on a phone call when all I hear is the cable rubbing against my clothes?!? grrr!!!! Damn you hype threads!