Couple of comments:
The Olympus E-P1 is not a SLR, when you're talking focus, live view and the like, it is functionally very different from an SLR.
Where is the Pentax Kx, or at least K2000?
You've failed to give credit to Sony and Olympus (and Pentax) for their sensor based stabalization which works with almost any lens.
What are the parameters of your image quality test? Are these jpegs straight from the camera? Raws processed in lightroom, what?
An almost monotone crop might give some idea of noise, but nothing of colour, dynamic range or contrast. A noise free image at iso 3200 sounds great, but that doesn't do a lot of good if you've compromised colour saturation to do so.
The Canon looks like it's losing detail as low as iso400 - or maybe it's not in focus, it's hard to tell.