I did a quick analysis of a 2000 QF timetable vs now. Interestingly, QFi have approximately the same number of seats (~69,000) and services (~245) out of Australia each week as they did back then. Which may sound surprising, but this has really represented a major consolidation at SYD, and to a lesser extent BNE. ADL, DRW, CNS and now PER have all lost international services . Sydney has gained ~40 services and 8,000 seats, BNE gained 13 services and 4000 seats and MEL gained 2 services a week and 1000 seats. (note to avoid distortions, I did exclude Qantas Link from the analysis which in 2000 served DRW-DIL on a 36 seat Dash 8 double daily but now serves CNS-POM 12x weekly on the Q400). Of course there have been a number of connections and end destinations lost in all of this.
In terms of services that have been moved to Jetstar, there haven't been too many, most of the services that have gone, have well just been axed full stop. Ones that did go to Jetstar are the DPS services, (which back then was only 10 a week in total spread across MEL, SYD, DRW & PER), the MEL-BKK service (6x weekly), MEL-CHC (4x weekly), half of the SYD-HNL services and of course CNS-NRT (daily), DRW-SIN (daily) & PER-SIN (double daily then on QF, now daily on Jetstar).