I have seen some HMC footage that doesn't look terrible, but yeah, in general AVCHD is consumer-level shit quality. If you care that much to spend on a prosumer camera, get one with features that actually make the quality of the video better vs. something more convenient and easier for the consumer. Plus HVXs have never been cheaper while an HMC will still run you around a grand.
further benefit: you will get ripped forearms and upper body in general if you get an HVX, it can be tiring to do a lot of handheld with that beast. HPX feels like a toy after coming from HVX.