I have to say that every T19 set I've seen has been pretty incredible. Maybe each individual one isn't as great as 1 really stand-out set, like I think the Shaman T19 is pretty bad, but overall... really nice stuff.
So if you had to rate every set in every tier and take the average number.. how would T19 rank for you*?
Hunters - get a Ranger set, might actually be their best looking set to date.
Druid - a cool Night Elven style owl set
DK - a solid LK-esque set
Demon Hunters - can't really compare it to anything but it's pretty nice in its own right
Mage - it's a middle of the pack set but not bad
Warlock - Warlocks have a ton of good sets so this might not crack a top 5 but still incredibly solid
Priest - basically an upgraded T1... not bad
Rogue - I dare say this might be their best looking set in the game. I have the MoP CM set, but it doesn't quite fit all the races really well.. This one is nice
Shaman - Probably the weakest set in the group but I like the elemental enhancements of each recolor
Warrior - a shittier T13 but still not bad
Monk - kinda weak but it's a monk set what do you expect
Paladin - Paladins already have a ton of great sets but this actually managed to possibly beat them all out. I like my MoP CM set and even T13, but this here might win them out. Plus it matches Ashbringer.
* Not considering MoP CM sets a 'tier' because I think that would win hands down.