It would be different between shops but I've heard 50/50 is quite common. It is 50/50 at liaisons and golden Apple and if a discount is used at golden Apple, the shop takes the hit.
At 42 & 5 Marrickville, I guess it would be 50/50 for the standard girls.
The premium and diamond girls would probably get more since they do more services. They might even get all of the extra costs over the standard girl.
Eg for 1hr pricing
Standard $160, $80 shop cut/$80 girls cut
Premium $190, $80 shop cut/$110 girls cut so they get an extra $30 for doing bbbj)
Diamond $230, $80 shop cut/$150 girls cut so they get $70 more for bbbj, cim, shower
If the diamond girls were split 50/50, the girl would only get $115 which is only extra $35 over standard girl for doing bbbj, cim, shower which does not seem worth it for the girl.