Maybe I should not reply because I have only flown Dragon Air but I think that CX owns them. I have never had any trouble with my big heavy carry-on rollarboard and separate laptop bag flying from the mainland to HKG. Also they have never charged me an overweight on my checked luggage (which is always the case because I carry a very heavy toolbox) except for once when I checked in at the train in Kowloon to leave HKG for the US and the CX/Dragon Air check in personal were busy and some random airline (I forget which but Asian helped out by checking me through.) I figured because it was brand X checking me in for brand Y she didn't overlook the overage like the brand Y people do. No complaints from me though because I was right at the forty-five minute deadline to check via the train. Of course YMMV, but I would risk it, get to the airport early enough to make sure that CX personal help you and have some space on the CC in case you get busted.