Evolution has beaten revolution in the 2018 Formula 1 pre-season season. So far, that is. The Mercedes W09 is not a dramatic change from its predecessor, but it is a clear step forward and shares one thing in column with its four ancestors in the V6 turbo hybrid era of grand prix racing - it has raised the bar. And it is seriously fast.
But with Mercedes there to be shot at, one thing appears to have changed. Ferrari has been aggressive with its car, switching to a higher-rake design and making changes to its aerodynamic concept.
The result is a car that might even struggle to be second-best. Red Bull, with its slim sidepods and, even with the limitation of its Renault engine package, emerges from testing reckoned by many to be the team best placed to take the fight to Mercedes.