What measurements? If you're talking about frequency response/sound signature, something being "better" is completely subjective.
From everything I've read so far, the the TH-900 has better resolution, detail, etc.
Resolution, detail, etc are exactly the subjective terms. Unless you refer to impulse response, CSD, distortion figures, etc.
I cannot link them X00 measurements here, but you can find them.
I think good measurements are a sufficiently necessary, but not necessarily sufficient condition to good sound .
The TH900 does have 3 serious (>10 dB) dips in its FR, which when improved do make a lot of difference on the perceived sound, when I compare it with a sufficiently flat headphone. Parts of it is still better than parts of other headphones, and that may be enough for your brain to pick the good and correct the bad, judging them better headphones than others, but as you said, it's subjective. It is a totally legitimate wish to get better measurements IF the sound quality also gets better. The two are in correlation, but there are factors that are not easily rendered by current measurements techniques. I am aware of research work on this front but it will take a lot of time to get to the industry.