This is a luxury sport sedan comparison between the latest 2013 BMW M5 and the 2013 Porsche Panamera GTS. Both base price seem to be fairly close but we are guessing the Porsche had more option added making the test vehicle priced at $146,250. If you want speed, it is clear from the specification that you will go with the 2013 BMW M5. But it is not always the speed when you are looking for the luxury sport sedan. This video gives quite a good review if you are having to choose between this two great family sport sedan.