The V8 engines of last year, and the radical new generation of ERS-bolstered turbo V6s, are actually producing similar overall power.
But the torque of the 2014 'power unit' is significantly higher.
"When I went out of the garage for the first time, I thought 'Wow!'" Mercedes driver Lewis Hamilton is quoted by Germany's Sport Bild.
Force India's Adrian Sutil had an even starker experience.
"When I accelerated out of the corner, I was surprised," said the German, recalling his first moments with the Mercedes-Benz V6.
"I changed from third to fourth gear, lost the rear and I spun."
Works Mercedes driver Nico Rosberg agrees: "The driveability with the turbo is a little bit of an adventure!"</p