Never found S12 that bassy except when EQed, and it got that sharp metallic upper midrange just screwing up any warmth. The S15 has much less upper mids and it helps, but still planar bass (DD fanboy)
Looking at measurements the EJ07M should be a little more warm than Cadenza4, still within what's natural I guess. Would probably love it, measurement look like something for me.
In a way the Cadenza4 is like a little brother of the Mega5EST that's so popular now, just a little extra vocal clarity on Cadenza4 and not as good air as Mega5EST.
Almost every set coming out these days are decent, cannot be easy right now to make top a IEM that will succeed for a long time.