I was comparing bank notes in my head the other day. The US has a $20 ($162HK), the UK has a £20 ($256 HK) and there is a €20 ($228 HK). A $500 notes seem hard to break sometimes, certainly troublesome with some cabbies early in the morning.
Kind of wondering if a $200 HK banknote has ever been considered? Seems to be a 'gap' in the notes available here between $100 and $500.