Was asking more from a fit perspective since the comments are that it is a 'tricky' last.
In terms of accessibility and risk of buying dress shoes online, if one is based in Singapore quite frankly, there is only a small handful of brands where u will get the 'luxury' of trying irl. Everything else is a risk. Heck, we have Ballgag prepared to pull the trigger on a 4 digit EG online, though perhaps he might have had a chance to try the shoes before in Europe?
In any case, u nailed the coffin for me with the last line (or from an optimistic angle, saved me some $$), assuming you are speaking with experience or knowledge of the last (which I am sure you have at least one or the other).
Yup I have a couple of pairs. I mentioned the first line becos i have spent money on shoes from meermin and alfred sergant only to find that the lasts are unforgiving and unwearable for more than half a day. Hope that I helped anw.
Alvinquah's post is way more detailed.
