JMB Sapphire is OW Sapphire, and while both JGC Premier and JMB Diamond are Emerald, the only difference is that if you join you can attain Emerald by acquiring 80K FLY ON points if you join JGC then with 5000 miles, instead of 100K needed for Diamond.
And for Emerald status you still need to qualify every year and no exceptions. That would be essentially the same with Marco Polo, where you would have probably more opportunities to earn miles with their routes.
Last edited by HKUSFLYER; Aug 13, 2018 at 3:35 am
Reason: syntax