dude, Shenzhen came a long way and is the future of China (I lived in 5 cities across the country in the past 12 years). Design is all over the map and is going to swallow HK in the next 10-20 years.
I've heard this case for Shanghai, not so much for Shenzhen. Interesting. The one thing I personally think is holding HK back from further flourishing is the pollution (thus Singapore seemingly having an edge at the moment). I imagine Shenzhen will face similar issues as it continues to grow?