Glad someone's done a three way comparison. Very interested to hear more of your experience with the video quality of the SR12. Camcorderinfo has a review on it's way, but not yet. I've heard it's much easier to handle, with the Canon next and the Panisonic last. Is this your experience? How does the Canon's audio compare with the Panisonic?
Yeah, why isn't there a SR12 / HF100 /SD9 head to head test? I did my own.
As far as handling I'd rank them in that order. Sony just knows what they're doing there. BUT the HF100 is FAR better then the Canon's HDV counterpart (HV30). I'd put the HV30 PQ above the HC9, but the HV30 feels so cheap that I'd buy the Sony for an extra $200. Not so with the HF100 vs SR12... they're much closer. The SD9 is tiny and feels it. Its very light, but I feel it is pushing the limit for ergonomics. Its almost too small when using it. Certainly its the easiest to hide away though.
Sony has a butter smooth zoom toggle and comfy strape. The SD9's zoom is a touch better than the HF100, but not much and the strap is the least comfortable (though its the lightest camera too). I did think Canon had a better menu than Sony though. With Sony you have to go through too many menus. The SD9 has few options, but they're easy to find.
Sony also has a nice single component/audio cable where the others have 2. Sony places the port in better locations, etc. The SD9 puts one port behind the battery -- odd.
Personally I wouldn't base buying on the above though. You'd get use to which ever you had.
Audio? The SD9 was killer. Listing in a 5.1 surround home theater you could hear where the sounds came from. BUT iMovie edits in stereo I believe. Sony's audio sounded as good, but less dynamic (stereo vs 5 channel). Canon was good, but slightly tinny. Interestingly the audio was better on all the AVCHD models -- the SR12 was better than the HC9 and the HF100 better than the HV30!
But again, video to me is the most important. I found ergonomics acceptable on all, as well as the audio. Good light, I only would fault the SD9 for its inconsistencies, but in poor light the HF100 is going to be the most forgiving.
Also, solid state vs hard drive? Got to lean toward SS. And SD cards are way cheaper the memory sticks! And speaking of cheaper? You could nearly by 2 HF100s for the price of the SR12 right now!