Set range to 1 day, top 75% of parses, and look at Mythic logs:
Nythendra: dead last, losing even to Affliction now which is second worst
Ilgy: middle of the pack, although this boss doesn't mean much because of how ooze padding works
Elerethe: dead last, second worst is Demo
Ursoc: sixth worst. Looking at damage to bosses, second worst.
Dragons of Nightmare: sixth place. With the way Havoc works you'd expect us to do significantly better.
Cenarius: bottom half. Only 8 classes are worse.
Xavius: fourth best. Again, padding. When you look at player damage to bosses we're the fifth worst.
On two bosses Destruction has been the absolute worst, and for both of them the second worst has been another Warlock spec. Our best fight clocks us in at 6th place, and that's a fight where we can use Havoc for 100% of the time.
I don't want to say the sky is falling. I don't want to make the Destruction situation seem worse than it is. I know that one day of data is not much to base an entire generalization of a spec on. With that said, this may show that to a certain extent, although Destruction didn't change all that much in 7.1, the lowest classes (Fury, DK Frost, Mage Frost, Affliction) got some fairly decent buffs and are now standing out a bit better among their competitors, while Destruction is stuck in a relatively bad place.
Are we starting to get left behind?