We started raiding slightly later than most this tier, but even considering that we are still having trouble getting this boss down after several weeks of attempts. The most recent log is here. The best attempt we have ever done is this one, which got Elegon down to about 10%. However on that attempt we were some 15 seconds away from enrage.
On that attempt we had a raid dps of 659,309 and a raid hps of 165,526. When I compare this to the averages for kills on this page, I see that we are about 100k dps below the average, while being 15k hps above the average.
I know that the healing required will get less as people get better at their roles, and in the same way the average kill dps is probably boosted by people doing this on farm. I just have nothing else to go on, as I do not know the other classes well enough or their expected dps. The guild armory is here if you want to look people up.