I ended up getting a mvx4i a few months ago so am biased that way too

best things about the canon are the size and the stills ability. Only negative is handling.
Downside for the sony is not so good stills and crappy memory stick.
At £290 the sony would be a no brainer but I thought it was more around the £450 mark a month or two back.
You could buy a stills camera to go with the sony but I'm another one that goes with the attitude the smaller it is the more it'll get taken out and used
If i was purely wanting best video the panasonic comes out on top of both of these I think. It's all very close though, I think most people would not notice difference in output from all three.
Off topic but anyone know what the replacement for the mvx4i is going to be?