Nico Rosberg admitted he was surprised by Mercedes' gap to Ferrari during qualifying for the Spanish Grand Prix, with their primary rivals only fifth and sixth on the grid.
Rosberg finished second to team-mate Lewis Hamilton at the Circuit de Barcelona-Catalunya, with lead Ferrari driver Kimi Raikkonen 1.1 seconds adrift of the Briton.
Rosberg expressed surprise at Ferrari's deficit but nonetheless remains wary of Red Bull, which secured third and fourth courtesy of Daniel Ricciardo and Max Verstappen.
"We’re surprised to be so far ahead, at the same time we’re also surprised how close Red Bull," he said.
"So it’s really changing around a lot, the only constant is us being up front and having a gap to whoever is second, it’s impressive for the team that on every track we have the car working perfectly and that’s fantastic to see."
Having headed Hamilton throughout the three practice sessions, Rosberg conceded that his team-mate was merely faster in Q3.
"I’m disappointed to be second, I wanted to be first today Lewis was just quicker in qualifying today, that's it," he said.