Curious what the prevailing thoughts are on OIS? I'm considering a zoom lens for my G5 to shoot quick-moving toddlers and their eventual growth into sports, etc. Today the Olympus 40-150 just went on sale for $119. I've read that this lens (for the price) does an excellent job and takes very sharp pics. The Panny equivalent is the 45-150 at $239. After doing some research, it appears that the main difference is the Panny has OIS. So my question: is it worth the extra $100-150 for the OIS given that my G5 body doesn't do it?