well, I had my first mythic raid test on tuesday and like in the HC raids before I hade no problems keeping up, usually outhealing all other classes.
i am running full crit build with 50% crit in raids.
I am not really into that mastery stacking stuff.
*edit*
Scaled to iLvL 810 I have:
Int: 18.690
Crit: 47% 14.315
Haste: 23% 7.557
Mastery: 178% 3422
Versatility: 8% 3193
Due to the fact that i cant püost logs here my skada stuff:
[19:52:28] [G] [110
ropee]: Skada: Dropee's Healing for Skorpyron (8): 00:21 (5 Min 41 Sec):
[19:52:28] [G] [110
ropee]: [Renewing Mist] 18.40M (16.2%)
[19:52:28] [G] [110
ropee]: [Essence Font] 17.60M (15.5%)
[19:52:28] [G] [110
ropee]: [Vivify] 16.60M (14.6%)
[19:52:28] [G] [110
ropee]: [Gust of Mists] 11.95M (10.5%)
[19:52:28] [G] [110
ropee]: [Revival] 11.94M (10.5%)
[19:52:28] [G] [110
ropee]: [Soothing Mist] 7.54M (6.6%)
[19:52:28] [G] [110
ropee]: [Enveloping Mist] 7.19M (6.3%)
[19:52:28] [G] [110
ropee]: [The Mists of Sheilun] 5.90M (5.2%)
[19:52:28] [G] [110
ropee]: [Blessings of Yu'lon] 4.29M (3.8%)
[19:52:28] [G] [110
ropee]: [Soothing Mist] 3.29M (2.9%)
[19:52:28] [G] [110
ropee]: [Chi Burst] 2.51M (2.2%)
[19:52:28] [G] [110
ropee]: [Effuse] 2.41M (2.1%)
[19:52:28] [G] [110
ropee]: [Life Cocoon] 1.68M (1.5%)
[19:52:28] [G] [110
ropee]: [Celestial Breath] 1.17M (1.0%)
[19:52:28] [G] [110
ropee]: [Sheilun's Gift] 1.15M (1.0%)
[20:02:55] [G] [110
ropee]: Skada: Healing for Skorpyron (8): 00:21 (5 Min 41 Sec):
[20:02:55] [G] [110
ropee]: 1. Dropee 113.64M (370.2K, 19.4%) Monk
[20:02:55] [G] [110
ropee]: 2. Isherya 94.56M (350.2K, 16.1%) Holy Priest
[20:02:55] [G] [110
ropee]: 3. Erathon 89.77M (268.0K, 15.3%) Paladin
[20:02:55] [G] [110
ropee]: 4. Curbyx 69.71M (223.4K, 11.9%) Shaman
[20:02:55] [G] [110
ropee]: 5. Yunavachette 68.26M (269.8K, 11.6%) Druid