Google is pushing and supporting WebP. Mozilla is pushing and supporting mozjpeg. Microsoft is pushing and supporting JPEG XR. Everyone trumpets their favorite format's superiority. The size of a compressed file can be measured, but the quality of lossy images is subject to human interpretation. How do we compare our choices? Are these formats and their codecs going to live side-by-side and be supported by most major software, including Apple's, or is the battle going to be bloody, with only some format(s) emerging victorious?