My server only has one really competitive Horde guild and the rest are fairly casual. All run just a few nights a week. We still have a little personal competition going on to see who downs bosses first on normal.
During MoP we used GuildOx to see who downed the bosses first. Now that they have been bought out they seem to be pretty useless. Last I checked they still don't even have T17 up. Is there any site that tracks guild progress on servers for current tiered raids?