I've been told that EI, AY and IB have fewer than 100 Emeralds each (rather doubt it for IB, but their plan is sufficiently quirky to discourage membership except for those living in MAD or BCN). LA is also quite low (probably under 1000). CX Diamond numbers were disclosed but I don't know if that is proprietary, however it is in the thousands. QF, BA and AA are in the tens of thousands (approaching 100K on the high end). So yes, there is roughly 3 orders of magnitude difference in number of Emeralds by OW airline. Sometimes this shows up in staff attitude, particularly at smaller airports where they may see one Emerald a month and think it is a VIP.