Atm, im sitting 114% Mastery, 22ish% crit and 4% haste. (ilvl 862)
An “easy” way (if you have the gold) is crafted item with BiS stats and upgrading them to 850.
Another way is to just spam mythic+2 for 3 chests with 3 geared friends and “boost” people with low ranking keys.
Right now i feel good about my stats, got to kill the first boss on mythic and try everything out in a mythic setting.