It was all about the Mercedes in Spain on Friday as, despite coming equipped with upgrades, none of their rivals were able to make any inroads into their dominance.
Nico Rosberg had the better of the early running although Lewis Hamilton was never far behind.
Returning to the track for a second round of work, Hamilton briefly overhauled his team-mate only for Rosberg to come back at him with a 1:26.828.
That time put the German 0.070s up, a welcome start to his Spanish GP weekend, one in which Rosberg knows he needs to claw some points back against his Mercedes team-mate.
Sebastian Vettel, racing a tighter, slimmer SF15-T that was sporting a new floor, diffuser and rear end plates just to name a few upgrades, was third quickest.
Worringly for Ferrari, though, he was 0.978s slower than Rosberg while Kimi Raikkonen in fourth was a further 0.03s down.
It was a great start to the weekend for Carlos Sainz, the quickest of the three Spaniards.
He finished up fifth, 1.304s down, while his team-mate Max Verstappen was sixth ahead of Daniil Kvyat, who was running a new shorter nose, Felipe Massa and Daniel Ricciardo.
The Aussie missed most of the session with an IC problem but thankfully Renault were able to repair the engine and he was back out in the final 15 minutes.
Felipe Nasr completed the top ten ahead of Nico Hulkenberg.
As for McLaren, Fernando Alonso. had been running inside the top ten until 20 minutes before the end of FP2. But, when all was said and done, he dropped to P15.
Putting in the laps in a new-look MP4-30 – not only did the car feature various aero updates but also a new colour scheme – he was 2.985s down. Jenson Button was P16.
1 Nico Rosberg Mercedes 1:26.828 29 laps
2 Lewis Hamilton Mercedes 1:26.898 0.070 28 laps
3 Sebastian Vettel Ferrari 1:27.806 0.978 21 laps
4 Kimi Raikkonen Ferrari 1:27.832 1.004 16 laps
5 Carlos Sainz Toro Rosso 1:28.132 1.304 28 laps
6 Max Verstappen Toro Rosso 1:28.529 1.701 23 laps
7 Daniil Kvyat Red Bull 1:28.785 1.957 7 laps
8 Felipe Massa Williams 1:28.831 2.003 21 laps
9 Daniel Ricciardo Red Bull 1:29.075 2.247 10 laps
10 Felipe Nasr Sauber 1:29.140 2.312 15 laps
11 Nico Hulkenberg Force India 1:29.409 2.581 20 laps
12 Raffaele Marciello Sauber 1:29.630 2.802 15 laps
13 Jolyon Palmer Lotus 1:29.676 2.848 21 laps
14 Susie Wolff Williams 1:29.708 2.880 22 laps
15 Fernando Alonso McLaren 1:29.813 2.985 22 laps
16 Jenson Button McLaren 1:29.817 2.989 23 laps
17 Sergio Perez Force India 1:30.096 3.268 19 laps
18 Pastor Maldonado Lotus 1:30.110 3.282 7 laps
19 Will Stevens Manor 1:32.471 5.643 22 laps
20 Roberto Merhi Manor 1:32.647 5.819 20 laps