I am starting to test out different functions of the 5D Mark II tonight. Just shot some ISO 6400 pics, all jpg straight from the camera, in-camera noise reduction set to standard.The pics were resized in Photoshop to 20% original size and slight sharpening added. No other post-processing was done. I just took these shots from my patio at home with the 5D Mark II and EF 70-200mm f2.8L IS USM. Obviously,these shots are not work of art, but I am quite pleased with the quality of the shots. 5D Mark II ISO 6400 + f2.8 aperture + IS seems to be a potent combo for low light photography. You can click on the individual pics for an enlarged view.