60 minutes to make a connection at 1:40 in the morning... What do I need to look out for?

Hi everyone,

First time flying CX and first time transiting through HKG, so I could use any advice you can provide.

In a little over a month from now, I am flying this itinerary.:

Flight CX501 from NRT to HKG, departure 21:40 arrival 1:40
Flight CX820 from HKG to YYZ, departure 2:40 arrival 5:45

I am aware of the fact that arrivals are on Level 5 and Departures on Level 6, so it's not like I can just get off one plane and go straight onto the other. I also believe I have to go through a gate to get back up to Level 6 -- hoping this might be automated, but not sure. I know I'll have to hustle, but does 60 minutes give me enough time to catch my next flight?

Also, slightly concerned about any checked baggage making it onto the next plane. I'm considering flying carryon only, but worried about the 7 kg weight restriction. Is that something that's strictly enforced? If I board with a backpack, are they going to weigh it to make sure it's under 7 kg?

Any advice would be appreciated; I am saving a lot of money with this somewhat circuitous itinerary, but it's only worth it if I can make my connection!