I have noticed that all my images when compared to both canon cameras appear underexposed by at least one stop. I have to set the exposure compensation to +1 to get a correct exposure.
I have found exactly the same thing. I use weighted centre measurement and with no compensation I usually find my exposures too dark for my liking. Luckily, the dynamic range of the sensor is such that I can usually compensate in Phocus or Lightroom without losing any detail in either the dark or bright regions (I do mainly landscape).