Is difficult to pinpoint which specialist discipline earn the most but among the top 5, I would say .... Neuro, Gynae, Cardio, Ortho and Rheuma.

And if zoom into each discipline, it will depends on the 'popularity' of the specialist. For eg, a Neuro in one hospital can earn 2 to 3 mil a year while the same specialist field in another hospital only earn above 1 mil.

Similar to GP clinics. Some, a patient can see the dr immediately upon registration while another, will have to wait hours. Why is one clinic always busier than the one few doors away ? That will roughly tell which GP earns more.

Consultation is 'cheap' but medical procedures are expensive.

There are many general medical doctors but specialists are limited in ratio to populations.

Rightfully, all govt hospitals should issue the bill according to current charges so that patient is aware of the actual cost and then deduct the amount as discount before paying the subsidised rate.

Excuses, there will always be a ratio difference, that's the way the human population why must charge expensive , where there is a will there is a way