I upgraded my camera from a Canon HF S10 (AVCHD) to a Canon XF300. I have been recording 1920 x 1080i at 52 Mbps, 4:2:2 color. To my amazement, it renders almost twice as fast as the AVCHD with the MC MPG2 template, 9200k peak, 8600k average, 3450k minimum, and the quality of my DVDs is enormously better.
Interestingly, the AC3 Pro render is much slower than with the SF10 files. Perhaps there is smart rendering going on, since the SF10 uses AC3 for audio.
Good glass, 3 chips, and a great camera codec brought me a long way in my quest for good DVD quality. (This was a ballet presentation in a theater, bad lighting and I was back about 20 rows from the stage).