I played WoW, and I feel that regular modes of Coil in this game feel like normal WoW, (maybe a tad harder) whereas Savage feels like Heroic. Right now the main differences are the lockout is shared and there's no incremental loot bonus. I don't care about higher ilvl gear dropping from Savage personally as all that does is create more item bloat, but I'd feel more compelled to do Savage mode if the lockouts weren't shared, because my group still has not seen BiS drops from normal mode after 20 weeks of raiding.