Upload & Sell: Off
I have no idea about those HK ebay dealers. I have never done any business with them. Some ebay sellers from HK are probably tiny office (or even individuals) inside an old building (not saying that they are not reliable, just not well known among locals).
This one from Japan appeared on my ebay radar... but since the price for a new one here seems not much higher, maybe I can let you take a look.
a 50 1.2 on ebay from Japan
They had one @$398, sold a few days ago.
[note: I am not in any way connected with the seller]
This is the price watch site I was refering to (it is in Chinese, but you get an idea about what the local price here... US$1=HK$7.8). But I haven't checked whether they are actually selling at that price or have stock.
Compare that to ebay price.... maybe I can buy one, use it and make a profit on ebay!
I'm really tempted to get one, just not sure if the older 55 1.2 is better; a friend went for 55mm, saying that the bokeh of the older lens is better, not as harsh.
Hope that helps.