Well, now that things are starting to setle down and after much more listening time and critical A/B's I think I can give you a more accurate comparison between the 2.
QT5 treble is more refined. It's on another level of detail and finesse. Better drivers possibly.
Mids as told before are warmer, fuller, especially noticed on female vocals, where they sound thin on the SW3 in comparison. Still the levels of detail in the mids are very high and instruments sound incredibly realistic with an excelent timbre.
Bass has superior definition, also more refined than SW3. The flap of the snare drum is more intense and impactful and this is something I like.
Now for me, this is a more refined version of the SW3, I wouldn't say other league because SW3 is pretty good, just more refined and better tuned in the mids.
Isolation is pretty poor compared to SW3, so if isolation is critical for you, go with the SW3, they're amazing. But QT5 does certain things better, of the 2 I choose QT5 sacrificing the isolation.