I own a studio and have used just about every camera you could imagine over the years. To make a long story somewhat short and easy to understand you will find that shutter lag is present on all digital cameras to some measurable degree.....even the absolute best DSLR's. However on a point and shoot camera the shutter lag is noticeable and on some point and shoots it is extremely noticeable so you really have to hold the camera steady while depressing the shutter button. One big advantage to using a DSLR is that while shutter lag is still present it is generally not noticeable and not an issue.

Tom