Okay, I did.
Disclaimers: Excluding any gear with Hit. Excluding trinkets. Excluding all cloaks except legendary healer cloak. Excluding socket bonuses. No differentiation between 1H, OH, and 2H pieces was made.
T16 PTR from wowhead (including MW heirloom pieces, which are higher ilvl it seems):
Mastery: 2/5 Tier pieces, 18/38 (47%) Heroic non-WF non-tier pieces
Spirit: 5/5 Tier pieces, 26/38 (68%) Heroic non-WF non-tier pieces
Contrast to T15 (TF is different because of Ra-den):
Mastery: 2/5 Tier pieces, 12/31 (39%) Heroic non-TF non-tier pieces, 15/36 (42%) Heroic Thunderforged pieces
Spirit: 4/5 Tier pieces, 25/31 (81%) Heroic non-TF non-tier pieces, 28/36 (78%) Heroic Thunderforged pieces
The facts, presented. Spirit looks better, Mastery looks slightly worse. What do you guys make of this?