Boggs, don't be put off by the astounding response to your simple question. It may seem like a joke to those living here, but for those abroad hearing the HK is one of the most expensive places on earth, maybe its just a logical questions. Really, this forum is usually much more hospitable.
Yes, you'll be fine on 65k a month. Yes, plenty of people make more (I am considering taking a drastic cut to around 65 seeking greater peace of mind and quality of life). Yes, even more people make less. Your own needs determine whether it is enough. Do you have mortgages abroad? Are you hit badly tax wise in your home jurisdiction? Are you already successful enough that coming here will be interesting, but still a reduced lifestyle? Will your post offer opportunities like time for travel in the area that can make up for any downsides? At 65k, unless you are spending in the very common 35k+ range for housing and decided to live the high life every night, you will have ample funds. Enjoy! Personally, I have gone for a much more reasonable 15k for housing, love Kowloon-side for its less expat orientation yet close enough for the "fix" we all need.