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I own the LCD-3s and technically the LCD-3s are the better headphones to my ears, no question. Closed headphones face resonances that open headphones do not. A sense of air and space is also "typically" better on open headphones too. The TH-900s are wonderfully rich (though a bit coloured) headphones, but they just don't keep up with the naturalness of the HD800s or LCD-3s IMO. But as closed headphones go, I've heard none better.
Now that you mentioned this, I also share my short experience with hekeli's TH900, HD800, and my Stax SR-507, all run from the same amp.
The TH900 sounded really good, but IMO it prefers a few music genres (electronic, jazz, rock, pop), but it's not as natural and true to instrument timbre as the HD800 and SR-507. The latter two sounded remarkably similar, both very open and natural, the Stax being a bit warmer, more emotional, with more natural wind instruments, more bass punch and a bit loose in imaging, whereas the HD800 was more precise, better controlled bass, very clean and musical sounding. It did not exhibit the treble etch which I've heard with the 4-5 other HD800's. IIRC this one had 22xxx series number, so the later HD800's seem to be surprisingly really good, especially for the price (sic!). In the end, I preferred my Stax and hekeli preferred his HD800, and I can understand why. I just have different priorities. I also warn you that at 40+, my hearing is rolling off at high frequencies, so check the highs.
But back to the TH900: it hits much harder in the bass/midbass, which sounds good with many kinds of music, and movies. I thought it sounded like a very cleanly equalized sound (with no EQ-smear), until I realized (with live jazz recording), that it has its own logic to layer the sound stage and the instruments. I was surprised. So I cannot say it's just EQ: the TH900 clearly translates / interprets the music, but the interpretation is very consistent, musical, and has a soul of its own, making the music enjoyable, but in the same time preventing the TH900 from being "the one" headphone for all. I just prefer the more open sounding headphones, like the HD800 and SR-507. Nevertheless, it is by far the best closed can I have ever heard. IIRC I liked it more than the Audeze LCD 2.2, and it is about on the same level as the LCD-3, although I think I would prefer the LCD-3 as it is more true to the music with a wider range of music genres (although still a bit dark to my taste).
Also keep in mind that with different amps, up to some (variable) limit, one may compensate each headphone according to the needs.
I think this is the shortlist to compare if someone ponders buying a TH900: Sennheiser HD800, Stax SR-507, Audeze LCD-3, Stax SR-007 Mk1. Since it is the only closed headphone from this list, it may be the only choice for some, and a very good one.