Well, my first impression is that it sounds like my FX700, which is a good thing. I basically bought this for better isolation. The isolation is average, but it's usable in busy streets now. The bass for FXZ200 is a bit deeper and slightly punchier than FX700. It's a small difference. You have to listen or compare really really carefully. The mids are not laid back. The treble is not really darker as others mentioned but it's not as extended. I just wouldn't use the word darker. But it has a longer decay. Unlike FX700, the treble for FXZ200 is kind of in your face. All spectrum is in your face. FX700's treble is kind of like a quick fling. Of course, FX700 has a bigger soundstage as most of you already know.
The timbre, crispness, etc is about the same. Unless you are an extreme basshead or unsatisfied with FX700's isolation, just enjoy your FX700 I guess.
I don't do reviews because I don't enjoy doing those and don't have the time/patience. So if anyone have any questions, please ask here.