I found this article dated June 15 regarding Cathay Pacific's pilot recruitment.
Female pilots on top at Cathay Pacific | smartjob
If you would take note, the picture "potential pay" (it alternates between a female pilot in a cockpit and a "potential pay") shows a second officer between 1-4 years as making HK 25,000-50,000, this is different than what CX's website says as "starting salary package is around HKD 45,000).
Cathay Pacific - Careers : Careers Home.
From the article, FO 5-9 years (HK$50,000 - $85,000); website - "FO in their first year can expect to earn around HKD 85,000"
From article, Capt 10-19 years (HK$85,000 - $200,000); website - "Cpts between HKD 130,000 and HKD 200,000)
So, are we looking at some "fuzzy math" or are there something that Cathay is not being upfront about because these numbers from the article seem to be pretty specific and also suggest it may take 5 years to upgrade to FO.