Go right ahead,
you need to take 16% off CX due tax (if HKG based). You need to add in EK HDP which is worth much more than CX HDP. You need to take into account ERP which is 7.5% of salary at the moment. Its more the 'area under the curve' rather than comparing position for position. EG, a CN1 in CX earns more but by the time he gets that position the guy in EK is on his 10th increment which puts him ahead pre tax let alone post tax. Look for some posts I have put on this over the last couple of months. I can tell you that after 10 years you are over 30% better off in EK (after tax dollars). Command time in CX is likely to be 13-15 years unless they start seriously ordering a/c. Given current CX orders command will be closer to 15 years.