Hey,
The T90 and K702 are both bright, but the T90 reminds me of a MDR-V6 with it's brightness and harshness of sound. The K702 is much smoother and sounds more refined, but lack the detail of the T90's. The T90 also has more bass, much more, but not bloated or exaggerated. The K702's abss is more reserved and lacks some weight but overall is more pleasant and smoother, if that makes sense. Now the midrange aspect is very different between them. Both have a midrgange recession, but the T90 has very little midrange to it. The sound is thin and the elevated treble does not help at all. The K702 is still somewhat thin but has a lot more body to it and sounds more natural. The soundstage differences are big to me. The T90 has a smaller more enclosed sounding soundstage, but offer a better sense of imaging. The K702 has a very wide and shallow soundstage, but the imaging is kind of wonky at times.