Want to compare tons of sensor data for various cameras you're interested in? Check out the Digital Camera Database.
DCD allows you to visually compare detailed sensor info (sensor surface area, pixel pitch, pixel density, etc.) for more than 3,200 digital cameras. The breath of information it provides is fascinating. I highly recommend taking a look.
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I agree it's interesting data but in the end it's only one data point. Like your Photokina and other articles about selecting the best camera for the job I highly weigh compact, light weight nimbleosity over sensor size. For me, the OM-D or LX-5 meets 95% of my needs. Of course I'm not shooting for the NFL or National Geographic, so obviously one's mileage will vary.
-Ed