The sheer cost of running a car in Hong Kong is astronomical, but generally the people are in for a penny/in for a pound and have them serviced well. I saw a lot of decent looking mercs over there last month, but they do tend to spend a lot of their time in monsoon conditions and sitting in traffic overheating.
Also be aware of the high numbers of stolen ex-HK cars. For quite a few years in the 90s it was common practise to steal a Merc and get it to the dock, drive it onto the back of a waiting speedboat and straight over to mainland China never to be seen again.