I think Hong Kong is quite ok for a single person with no ties, and if one has been a chef in London, I dare say
' the life' isnt going to be that much different in HK for any decent outfit ie Hotel etc
It gets a a little more daunting where young children apply and the usual HK idiosyncrasies but you dont need to concern yourself with that.
Things you will have to get used to:
waiting in lines
people not cleaning up after themselves
humidity get used to perspiration at times
Housing in HK is going to be small, kitchen is going to be tiny with limited bench space, likely no conventional oven, a two burner gas hob, a front loading washing machine also occupying kitchen space, a small sink and a fridge. your washing is hung out the kitchen window ( usually ) You'll probably eat at work or bring food home I guess, so not a big deal.
Get used to sitting about 2 to 3 metres from your tv in a lounge room that is just big enough for a small sofa, possibly fit a small dining table and I mean small. A small bedroom that will have most of its floor space taken up by a double bed and a tiny bathroom shower vanity and toilet, no built in robes so I suggest you pack light as most typically sized western furniture is proportionally too big for an average one bedroom HK flat.
My suggestion would be to buy second hand furniture in HK via the many expat classifieds or shop at HK Ikea, which will be sized accordingly to a typical HK flat of 450ft2 gross size.
For the first couple of years that you are in HK, you'll explore all of what HK has to offer in regard to its touristy places to see and do, but remember it is a tiny little city, and you can also fly to other locations in Asia, which are close at hand when you have some time off, like Vietnam, Macau, Xiamen, Shanghai, Beijing, Xian, Singapore, Thailand, Sth Korea, Japan etc while you have the opportunity and want a bit of a change in scenery in winter and summer.
So my advice, give it a go, it will be great international experience for you, after about 3 months you'll find your feet once you get used to your new routine, surroundings and the kitchen dynamic at work etc.