I saw one today in Freiburg, and well, the XF is a sick looking car in general, eventhough I prefered the XF-Concept, but I find the XFR is not more noticible than the XF, there are so few defferencies that an average person would not know that it is the XFR and not the XF. Anyway I would take the M5, NA engine and it performes nearly as good as the XFR and the RS6 that are FI. Yet the M5 is pretty old, but wait for the next gen, it revs up till 7K, it is not 8K but still better that other FI. But I think the M5 engine will be defferent than the X5/X6 M engine, it may get up to 600 hp and 700 Nm and even rev till at least 7.5K.
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