I lived and studied under the path (where the banking occurs) of the Rwy 13 Approach back then, it was noisy enough to interrupt our teacher every 3 minutes for say 20 seconds. And there was "always" a plane departing in between the 3 minutes interval, although not as noisy as it flew over towards the sea.
I also noticed that, the local players, namely Cathay Pacific, usually made the approach path a bit wider and a bit more towards the hill so they can have a longer final and a shallower angle of turn, then the published procedure.
Also rememered I can occasionally feel and hear the wake turbulance even from a meduim weight aircraft, from my school playing ground in the good old days..
Long live Kai Tak..