The earlier part (i.e. pre-Curator) of KZ, yes. Aran, Netherspite, Prince, Nightbane? I've not met anything in a Heroic that were on par with them (though for different reasons).
That's not to say that gear does not make a difference. As an example of how much gear changes, I healed Heroic Ramparts on my paladin in quest blues and greens at level 68 with less than 800 +healing with basically no problems.
It was possible because I had a Shadow priest and a well-geared (~T4) Feral tank.
I had just as much fun with the instance yesterday, healing it once again. This time the tank was a 11k health, 13k armor warrior, and no Shadow priest, and I had a mix of quest blues and epics, around ~1.3k healing. It was mostly the same.
That's not to say that gear does not make a difference. As an example of how much gear changes, I healed Heroic Ramparts on my paladin in quest blues and greens at level 68 with less than 800 +healing with basically no problems.
It was possible because I had a Shadow priest and a well-geared (~T4) Feral tank.
I had just as much fun with the instance yesterday, healing it once again. This time the tank was a 11k health, 13k armor warrior, and no Shadow priest, and I had a mix of quest blues and epics, around ~1.3k healing. It was mostly the same.
Earthen Ring-EU:
Taelas -- 60 Human Protection Warrior; Shaleen -- 52 Human Retribution Paladin; Raethal -- 51 Worgen Guardian Druid; Szar -- 50 Human Fire Mage; Caethan -- 60 Human Blood Death Knight; Danee -- 41 Human Outlaw Rogue; Ainsleigh -- 52 Dark Iron Dwarf Fury Warrior; Mihena -- 44 Void Elf Affliction Warlock; Chiyan -- 41 Pandaren Brewmaster Monk; Threkk -- 40 Orc Fury Warrior; Alliera -- 41 Night Elf Havoc Demon Hunter;
Darkmoon Faire-EU:
Sieon -- 45 Blood Elf Retribution Paladin; Kuaryo -- 51 Pandaren Brewmaster Monk
Taelas -- 60 Human Protection Warrior; Shaleen -- 52 Human Retribution Paladin; Raethal -- 51 Worgen Guardian Druid; Szar -- 50 Human Fire Mage; Caethan -- 60 Human Blood Death Knight; Danee -- 41 Human Outlaw Rogue; Ainsleigh -- 52 Dark Iron Dwarf Fury Warrior; Mihena -- 44 Void Elf Affliction Warlock; Chiyan -- 41 Pandaren Brewmaster Monk; Threkk -- 40 Orc Fury Warrior; Alliera -- 41 Night Elf Havoc Demon Hunter;
Darkmoon Faire-EU:
Sieon -- 45 Blood Elf Retribution Paladin; Kuaryo -- 51 Pandaren Brewmaster Monk