yeah, you are right
Also, HK model is sort of trim-down model,
for instance the model you mentioned is using the same x300 panel but come with much better specification, and now, SonyUSA just put up a big discount.
I made a quotation from a Mongkok shop, they don't have 52" model, they got a 46": HKD$28000 with $4000 supermarket coupon
Amazon is selling 46" XBR4 @ USD2659 around $20700
there is almost HKD$4000 different
few more things to consider:
1, how much to ship a 46" or 52" TV back to HK (not a problem to pilot?)
2, TV system is different, US model is using NTSC and HK is muilt (no problem to watch NOW or Cable)
3, no warranty
4, HK model can receive local analogue signal (though they are crXXX)
5, piano finish (only US model, USD300 extra)
However, if really like to get a parallel import TV, why not go for a Japanese model? now they come with simple English manual
like the latest Sony 46F1
using the same panel as the above models but only 7.4cm thick, 270,000 yen, ie HKD20000
personally, i still prefer to get electronics with warranty, just my 2 cents