Not true about only FO’s. Some carriers only allowed the captain to do the IGS approach. The approach mostly was a long straight in which would have plane’s fly downwind until turning base to final over the now current airport off Lantau. Some days a visual step down was done off Chueng Chau Island or south of Hong Kong Island wrapping around Repulse Bay and then onwards to Stone Cutters Island. They used a localizer aid that would guide you right towards the big red and white checkerboard hill that was used to assist in acquiring visual reference to perform the turn off the middle marker which was generally around 650 feet of memory serves me right. Big curving approach lighting was on top of all the buildings bellow to help with the procedure. A southerly wind would generally result in some dramatic bank angles which was just jaw dropping at times watching a 400 cranking out a 30 degree bank at 500 feet over a densely populated approach path. The Cathay Pilots tended to break left off the approach path towards the checker board which would allow them the ability to have more wiggle room with the turn. If you look at pictures of videos you’d notice often when foreign airlines where left wing way up in the turn Cathay was already wings level. Yes, I do miss Kai Tak!