So I'm terrible at writing comparisons. I'm more of a "listen for awhile and let my ears tell me if i like the sound" kinda guy.
That being said, I own HPH-200, MT220, and EPH-100 right now.
My favorite (might surprise you) is the EPH-100. Seriously, they are just about perfect in terms of sound signature for me.
I love their punchy bass, warm smooth mids, and the highs are sparkly as I like them, but certainly on the tame side. The treble spikes are exactly where I like them where they are not fatiguing but add excitement to my music. The sound has a great 3-d immersive presentation. These things are just tight and punchy and exciting and sound great to me. I like these more than most full size headphones I've had, the sound signature is just spot on. Every time, these buds make me happy.
The HPH-200 is warm-ish. The treble is there, but it's not overly done. They can be a bit sibilant though. For the price these are in the US, these are a steal. I am also impressed by their soundstage. The width is quite excellent. Like the EPH-100, they play perfectly without any amp. Detail isn't the best, but again, for the price you cannot complain. Bass is a little on the loose/boomy side.
The MT-220 is not as warm as the two others. More treble, more sharpness, more detail. These give you a lot of detail. Somewhat sibilant or sharp to me. I think someone described the treble as a bit icy, and that sounds like a good way to describe it. These have nice bass. These are more neutral, but not in a boring way. They are very impressive in terms of detail retrieval and the fact they are closed makes them versatile.
I've always been more of a listener than someone who cares very much about technicalities. I like a pleasurable listening experience above all. This is why I really like the EPH-100, as it gives me that listening pleasure. I'm appreciating the MT-220, but it is a little bit more analytical and serious to me than the EPH-100 and HPH-200, which are there for pleasure listening.
All three of these are great headphones and represent great value. I think my whole description above is more to say that MT-220 is the more serious headphone - which makes sense considering it is categorized as a monitoring headphone. The other two are consumer oriented.
What's most exciting to me ATM? I've ordered the Focal Elear - can't wait to give them a try.