I've been doing some comparisons between disc spamming atonement and resto druid spamming wrath with DoS or HotW.
I would really like to get numbers of disc priests who played Protectors HC/Normal/LFR/Flex - how much DMG Done and Healing Done they did. around 540 ilvl would be ideal.
Just go on the PTR and make a druid and priest. Go to a dummy for one minute, and see how much damage each class does. Then convert it into healing. Atonement is 90% of the damage, then you add mastery, and then add the 20-30% more from crits, and that's your healing done.
100 damage = 90 healing
With 20% mastery and 20% crit= 79 healing from normal hits and 21.6 from crits for a total of
100 Damage = ~101 Healing (rounding)
I might be doing that terribly wrong since it's very early, but that's the idea.
I don't see why you care if it's protector specific, but it would be best to just ask for people's logs.