What follows is more than an exhaustive evaluation of the most competent production sportbikes in history; it's also the height of hair-splitting, the epitome of nitpicking. Why? Because when you're dealing with what's arguably the most closely matched foursome ever, unearthing their few faults and identifying their many small differences takes much more than bland generalities and wishy-washy conclusions. (God knows there's enough of that around.) So we went the extra mile, testing on fast roads, slow roads, traffic-choked streets and long-distance highways; on rough roads and smooth roads; on the dyno, at the track (two, actually); on the strip and at our Top-Secret, High-Desert Test Facility.