Ok as promised... I've already pink noised my ms1 for around 20-30 hours, and play with music for another 30 hours this week. Man this really a busy music week for me. Here we go SR125 vs MS1... I used several mp3 (192kbps to 320kbps) and apple lossless files such as song sung blue (jheena lodwick), hotel california (eagles), knockin on heavens door (gnr), baiao de 3, lost and everything (buble), my grandma & penghu bay (chiao peng-basso1), summer of 69 (bryan mtv unplugged)
both phones using my ipod nano 8gb 2nd gen and ipod video 80gb, and bowl pad with kramer's basshead mod.
Conclusions: like my initial impressions, both really sounds familiar, if you just listen for only 5-10 minutes, you won't hear the differences. Both has a great gradoish treble and forward mids. But after a while you will notice a light warmer and more enjoyable feelings on MS1 especially on jazz music. I think ms1 has more "character" and less fatigue and less boring. On rock and live music performance I like both phones. One sounds more live, other more warm.
the definite difference are in bass or low freq, MS1 has more juiced in this department. Every song I hear has a deeper bass on Ms1 than SR125.
again, I think both are really really similar, maybe this is just my ears. Also I don't have any portable amp, so maybe that could differ both of this phones.
I'm really happy with MS1 just because it can exceed my expectation and really optimized ipod internal amps.
That's it folks...