O fare class in itself doesn't necessarily mean anything these days. Some airlines segregate their Lite or Basic fares into different booking classes, but not all do.

On MH, Lite and Basic fares do not include free seat selection. Seat selection is not a OneWorld benefit, although some airlines do extend that courtesy, it's not a requirement. It appears that MH is only extending that to their own Platinum members, but not other OW Emeralds.

Other benefits like extra luggage allowance, priority check in and boarding and lounge are based on your status, those are published benefits. As Sapphire you'd have 15kg on Lite and 35kg on Basic for luggage allowance. If you look at the stated luggage allowance you should be able to identify if you have a Lite or Basic ticket.