The W220's photo quality is good, particularly at ISO 200 and below. Viewed at their full 12-megapixel resolution, there's some noise at all ISOs, but it's least noticeable at lower ISOs. Photos are still good at ISO 400, but soften a bit from noise reduction. Sharpness and detail decrease rapidly above ISO 400, but color remains fairly consistent. ISO 800 is usable for small prints, but everything above that is noisy and smeary.
To help pull out shadow details in your photos, Sony includes its Dynamic Range Optimizer Standard and Plus technology on the W220. Unfortunately, it didn't seem to do much on this series of shots. However, I have used it on other Sonys and it does work, so maybe the camera or I was having a bad day.