works bestin good lighting, but can work really well in dark too, ive just upgraded the firmware on mine to v20.xxx from 12.xxx. not sure if the camera will have imporved though. will let you know later after my night out on the lash!
Honestly, in a cloudy/misty day like that, you'll struggle with a SLR.
In good light, it's not that bad.
Still won't use it as my main camera thou.