I always thought that CX had preferential treatment for gates 1-4?
[Edit]
I just checked CX's website, and it says:
When you fly with us, you will enjoy some unique privileges when you arrive at the Hong Kong International Airport, our home. For a start, we have six preferred Arrival / Departure / Transit Gates -- conveniently located next to both Immigration and the Arrivals Hall. That means no more long walks to get to the Immigration counters, or a mad dash to catch your flight!
So, I'm guessing 1-4 are 4 out of the 6. I wonder what the other two are.