It’s fair to say that few automobiles have ridden atop their segment for as long as the BMW 3 Series has managed. Admittedly, there have been occasional frights from other German automakers or the odd Asian upstart, but it’s as if Munich’s engineers long ago brokered some sweetheart... 

The outgoing BMW 5 Series may have ushered in a dramatic leap forward in terms of dynamics, technology, safety and creature comforts, but it’s the previous generation – the E39 – that Bimmerphiles still speak of in hushed tones. The departing E60 may have been a more capable package, but...