Please do not go OT again. This is CC thread.
I did happen to post below in another thread today but since you asked, post here for your reference.

Date/Card/USD/RM Billed/Rate/EX Rate/Ratio

19 Dec/Amex/75/267.83/3.571066667/3.470762104/1.028899867
14 Jan/Amex/30/109.33/3.644333333/3.572562581/1.020089432
10 April/Amex/3128.74/11602.77/3.708448129/3.607688457/1.02792915
1 May/UOB/60/218.68 /3.644666667/3.560319931/1.023690774
18 April/UOB/48/177.67/3.701458333/3.627296141/1.020445585
1 June/HSBC/200/710.59/3.55295/3.472223573/1.023249202
9 July/Alliance/43.03/155.48/3.613293051/3.56400013/1.013830786

From above AMEX charge card admin fees for overseas transaction varies between 2%-2.8%
UOB 2%-2.3%, HSBC 2.3% and Alliance 1.38%. Above table does not represent actual charges as the currency may have fluactuated up or down from the day the charges were transacted.

As many said, Alliance do not charge admin fees but I guess Visa/MC admin fees itself is about 1%. If Amex reduce the admin charges to 2% instead of 2.5%, then it is competitive with other CC except Alliance.