Former Hardcore realm first raider LF serious pve guild

Hello there, i am Shamenz which is my main shaman. I formely raided with Is a Cookie on cataclysm during the later patches , firelands hc and dragon soul normal and heroic and we were strifing for Realm first achievements. I started on mists of pandaria with some of the is a cookie core members until we fell apart. After that i joined imperial and we downed most bosses realm first. including most of tot normal and Mogushan vaults (heroic) until most of them went retail. after 8-9 months absence i want the same experience once again. i saw that warmane finally got tot heroic done and are working towards siege of orgrimmar. Which are the top raiding guilds pve wise which are competing for the realm first achievements ? or is the server died out of competetion? :(

i got multiple chars, mostly geared from 515 till 530.