This was from a Bib Gourmand chain of Cantonese soup stalls called Ah Er. Or at least, one of their franchised outlets held the designation briefly one year. Apparently each outlet handles their soups a bit differently, and this wasn't the one that Michelin blessed. But I liked it.
I ordered my favourite Buddha Jumps Over The Wall ($7) which comes with generous ingredients such as fish maw, mushroom, abalone and chicken. The soup which has been boiled for at least 2 hours, was very intense and rich in flavour.