Really, there's no justification required for bringing a trio of M5s together; for more than 30 years now they've been the definitive super saloons, combining amazing engines with lairy dynamics and a certain muscular style that's made them hard to beat. And very easy to love.
So 'because M5' would have been reason enough, but the real logic behind bringing together E39, E60 and the latest F90 Competition was to see just how far the model has evolved since the turn of the century. Ostensibly the current car is a V8 powered, four-door saloon with a sporting bent, just like the M5 was in the year 2000. But you'll know that so much has changed since then also: automatic gearboxes, turbochargers and four-wheel drive being just the start.
The aim, therefore, was to discover whether so much of what was loved about the E39 - and to a similar extent the wild V10 version - has made it to the latest M5. Yes, yes, tough job and so on. It's a feature you can read on PH in the coming days, one for a dark and dingy winter night with a festive drink in hand - even if we do say so ourselves.
It won't spoil anything to say that all three 21st century M5s are superb in their own unique ways, which is why we couldn't limit this Pic of the Week to just one option. See below for a pair of choices, and get downloading now!