I will give some sample tax/charges on AM for the rest of your comparisons:
1. Tokyo - RM720
2. New York / LA - RM1347
3. Milan - RM1210
4. Paris - RM1517
5. London - RM2086
6. Sydney - RM1433
I would say this comparison is the absolute basic usage for the Frequent Flyer program, as you can get even better value when you look at other aspects of the programs, such as partner redemption etc, for example:
1. you can use KF miles to fly to Dubai at 49k, then spend another 29k on star alliance flights to europe, it is cheaper than outright redemption on SQ to europe, with a stopover (currently there is promotion flying to dubai for only 34k) but with a bit more taxes.
2. For AM, you would not redeem CX to fly to Australia as that is taking the long way. You could just outright redeem MH or even QF flights with less miles and shorter travel time.
3. If you look at Multi carrier award redemption for Asiamiles, you may get some seriously outsized value. for example flying to NYC cost 170k miles, if you use MCA, it will cost 165k miles, and you can take some extra flights up to 20000 miles total travel distance, eg you can go via hong kong with cx and return with AA + JL with a stop at Hawaii and Tokyo
So my conclusion is use KF miles if you want to fly SQ, because redeeming on other partners (with the exception on some routes) will cost you as much taxes as they did on AM. I find AM generally gives better value and flexibility, unless Im fixated on flying SQ suites.
Thanks for sharing, I already dump all point into AM.