Sebastian Vettel says F1 upgrades are about quality, not quantity, after seeing Mercedes' heavily-revised W08 challenger dominate Friday practice ahead of the Spanish Grand Prix.
Barcelona's race is traditionally when the development battle steps up a level, with the race held the doorstep of every team's base. Mercedes rolled out on Friday with a radical slim-line nose as part of a big upgrade package, while Red Bull appeared to have cut the gap to Ferrari with its own B-spec car.
Vettel himself had a messy day, one which included some gearbox trouble in FP1 and a run across the gravel in FP2, and he believes there is plenty to come on Saturday before qualifying.