Just throwing in my 2c, I'm MEL based so a lot of my internationals involve SYD-MEL I-D transfer, I have always been happy to go by MCT flying J (1h30), but if you're off the plane last it could be crowded.
I have had times where late arrival inbound has meant QF have already moved my connecting flight by the time I've landed, annoyingly once as I walked past the gate of my original flight as it was boarding, but they insisted I couldn't make it (fair enough, I was going to the QF bus terminal of doom past the check in cut off, despite OLCI-ing - VA have put me back on a retimed flight before in similar circumstances, as I always travel HBO).
The good news is that QF-QF on a single ticket is seamless, I've never done it, nor would I risk it, on split tickets, or different carriers, without a significant buffer.
On a related note, my inbound to SYD in a month or so was retimed so the connection was 1:20 (from 1:35), I had to call them because it wouldn't let me do anything online, but I suspected (and agent confirmed) it was down to MCT, was resolved in minutes, I'll just be arriving in MEL an hour later than planned.