When I first demo the x, I found the mids was a bit forward.
Maybe I used to the presentation of both th900 and hd800.
After living with a pair for about a week, I found that the mids didn't bother me.
This phone had a great tonality. Nice holographic (and decent size) soundstage and smooth presentation.
Overall, I still prefer hd800 but easily better than my th900.
Actually I'd say the mids on the TH-900s are slightly recessed from neutral, while pretty much bang on with the LCD-X.