This is an interesting article in which the author decided to move away from testing specific cameras and just focus on the limitations of various HD codecs:
http://digitalcontentproducer.com/...mats_0922/index.html. In brief he concluded that high-end AVC encoding (24 Mbps) is between HDV and DVCProHD in quality, which fits with general technical expectations. This doesn't tell us how specific cameras will perform relative to each other, but does bode well for the new Panasonic HMC150.