There are very few of the old buildings left that were built in the 20's - 50's. Most have given way to skyscrapers and huge apartment complexes.
The subway system is amazing. Clean, fast and on-time ! But, you are never alone ;-)
There are still a lot of bikes in China. But mostly driven by an older generation. Electric scooters are ubiquitous - silent and deadly !
HK is always crowed and busy. Lots of hills and unbelievable views. When they say it is rainy season, they mean it !
Sure, there are plenty of grocery stores, but street food, cooked or ready to be cooked, is still a big part of every day life.
It is amazing to witness the skill and balance that you see everyday from the trike and bikers. Seeing a family of four or five on an e-bike is common. Carrying cargo four-times the weight and size of a trike is mere child's play. But overconfidence can make it a long day !