Just a quick question from a long time lurker, first time poster: can anyone who has owned both versions ("ex dn" and "ART") of any of the Sigma 19, 30, or 60mm lenses confirm for me if startup time has improved on the newer versions? I've searched this site and the web extensively and can't come up with a definitive answer. My reason for asking is that I have the Sigma 19mm ex dn, and I'd like to replace it with the new version if it boots up faster. My epm2 takes about 3.5 seconds (timed) to start with this lens on, and I feel it causes me to miss quite a few spontaneous shots of friends and family. I love the look of the shots I get with this lens though, and I love the handling and focus speed, but I can't afford to spend more on a lens I know is faster, such as the Oly 17mm 1.8. Thanks!