I took an interesting tour of ZRH airport back in May during a long connection and they took us to the garage where all the winter snow clearing equipment was. It was extremely impressive how many ploughs, de-icing vehicles etc they have (although they were taking their summer rest at the time). Obviously they need it there more than here but it shows what you need to keep an airport like ZRH running during the winter. I've flown from ZRH before when there was rather heavy snow fall and I was amazed that I was only 15 minutes delayed, and that was the time it took for the de-icing. I guess this is the first snow fall of the season at ZRH so they may be a bit rusty!

Back to the OP, as previously stated you are fine in terms of getting to HKG without further expense to yourself and hopefully you will get out tonight. I doubt if lots of connecting flights are delayed they would leave for HKG on time. That would just leave them a half empty A340 and a big problem rebooking all the pax. Better to leave 1 hour later which won't have any knock-on effect for scheduling as the aircraft sits in HKG for a long time before returning to ZRH anyway. If anyone can make it happen it wil be LX! Enjoy Number 1 lounge and your quick limo transfer from the aircraft to the E gates in ZRH