http://db.vanillagaming.org/?itemset=466
A good set, but not better than what was posted (imo).
ZG ring set = 1.2% crit, 1 hit, 78 ap.
List (pre-aq set) = 0.4% crit, 1 hit, 92 ap.
So the difference would be +0.8% crit and -14ap for the ZG set.
Also about the crit diminishing thing, it was more along the lines that agi and ap are more sought after towards endgame, because you're already going to be decked out on crit from talents, the gear, and buffs. Agi/ap would benefit you more than crit, because crit is only as strong as the AP supporting the damage. As a not so reliable source, when raiding here on my hunter, I was nearly the same gear level as the other hunters when starting into MC, yet I went with more crit over agi/ap, while 2 others went for agi/ap over crit stacking (we all had 9% hit). They won the meters over nearly everyone else.