Shot off the back deck today around 11 AM - roughly the same time that I tested my 16-35L lens. Its probably not visible in this size, but there's a very small amount of CA along the high-contrast boundaries at the edges and corners of the image. A little USM in Photoshop Elements 3 and showing the image at a reasonable size eliminates that. The CA is not severe, just barely noticable if you're looking for it on the full-sized image.