The image of the EX3 is slightly better than the HPX-200, but the recording format of the Panasonics is more robust (and less compressed). You can’t shoot concerts with the EX3 though!!! I learned that the hard way. With a CMOS sensor, there isn’t a global shutter, so if you shoot strobe lights or flashes (like from cameras), you get segmented frames: that is, the upper or lower half of the frame is white while the other half of the same frame is normal. This is also true of the RED One and the Ikegami studio/OB CMOS cameras.
If you want a comprehensive comparision of these and a bunch of other HD cameras, I’d recommend going here: https://www.highendtv.com/ and click on their “Shootout 2008”