I just ran a quick comparison:
Original: 250kB http://files.sina.is/original.jpg
Compressed by JPEGmini Lite: 133kB http://files.sina.is/jpeg-mini.jpg
Compressed by MozJPEG 3.0 @ Medium: 82kB http://files.sina.is/moz-medium.jpg
Compressed by MozJPEG 3.0 @ High: 141kB http://files.sina.is/moz-high.jpg