Quite common if you work in the larger PLCs and MNCs. Head of department or their deputy/assistant should be around there.

My common benchmark is your years of experience. If you have 15 years = RM15k salary.

Not every job can be replaced by quantity especially higher end/ skills based/ decision making / people management job.

For example:
1) You can't replace Lee Chong Wei with 3 players. Skills based.
2) You can't replace Elon musk experience with 3 assistants.
3) You can't just replace Gordon Ramsay with 3 sous chefs as other staffs may not buy-in

I can go on but I am curious what is your objective/ point of interest here?

You can download from headhunter salary survey as well:
https://www.hays.com.my/salary-guide

If you want further benchmark, can check robert Walters and Kelly. You can see rm15k is quite normal for many experienced skillful roles.

You do know the concept of foreign currency? If that's the case a Singaporean worker will always earn lesser than its UK and US counterpart? You do know the concept of purchasing power parity as well? SG is highly competitive as they have expats as well competing with their citizens there. You see plenty of SG citizens working at fields that mys will scoff at such as at food court centers, dockyard and hotel services. In MYS, most of these are outsourced to South Asians. Just go and see their national zoo workers.

I see no reason/ purpose to show off. Again I can't see what are you trying to achieve here. Are you:
1) Looking to get into the RM15k club but you not there yet and want to know how? Get promoted/ change company. Cannot find opportunity? Keep searching and network. Plenty of people fail before they get to where they want to go. Everyone wants the glamour of a CEO, not everybody willing to have a meeting at 11pm on a Saturday night though or sleep at production plant during crunch time.

2) You are not in the RM15k club and you are unclear why people are paid such high salary? I can recommend few books/ articles but in summary you create value, you will get paid. You can create value by work hard, smart, cheat, manipulate, hustle, ...etc.

3) You are not in the RM15k club and you are frustrated and unwilling to work to get there. Feel free to find articles to support your mental well being at bored panda whichever makes you feel better.

Just to add that not all industry pay structure are similar:
1) Sales/ Deals/ Front-end jobs have lower basic salary than others but compensate with higher bonuses in good market ranging from 6 months on average to 1 year plus.
2) Contract Vs permanent structure. Higher level or C-Level normally operate under 2-3 year contract. Hence they will normally look at yearly remuneration (US) than monthly or weekly remuneration (UK).
3) Profit sharing or dividend based. If you work under startup/ entrepreneurship or project driven work, your basic may be even zero/ negligible and 100% performance driven. Same applies to certain property agents that are mainly commission based.
4) Consulting driven. Some firm's charge per hour while some when you win the case. How you get paid depends on how large and how high up you on the hierarchy.

In summary, salary comparison itself is not really meaningful without considering all the relevant factors.

Every profession got different spectrum for pay range. You have sales job promoting credit card at aeon and the sales director driving lambos to meet datos. Same with IT, you have those doing low end data programming to those that design the whole infrastructure and network.

Every profession got different route and timetable so don't judge. You can laugh at a farmer stink with manure until you see his 100 acre land and 10 mers at home. Those IT professionals you see can also lose their job once technology become obsolete overnight like how cloud affects traditional data centers if they cannot adapt.