Congrats on being SL! It is no small feat, as CX SL can be harder to earn than many partner OWS statuses. CX has some of the world's best airline lounges. That and business class level ground services... its hard to say what you are missing not being SAPH/EMER!

The biggest unpublished benefit for SL is perhaps higher op-up chances, perhaps ranking ahead of even partner OWEs. With how oversold CX flights are in Y these days, it's a nice perk to have, athough this definitely falls into the 'not expect by right to be entitled to a privilege not stipulated' category. Enjoy the occasional red light beep at the gate!