Sebastian Vettel believes that Ferrari has made the biggest progress out of all of the Formula 1 teams compared to its performance in 2014.
Ferrari finished fourth in last year's championship, with just two podium finishes, but is currently second best to Mercedes, with new recruit Vettel returning the squad to the top step of the rostrum in Malaysia.
When asked why Ferrari had suffered a lack of pace at the British Grand Prix, when it was comfortably third fastest prior to a strategic call leading to a podium finish, Vettel defended the team and pointed to its revival so far in 2015.
"If you look where the team was last year, where it’s coming from in terms of car performance, team morale, everything is a lot better than it was," explained the four-time champion.
"I think Ferrari has done the biggest step out of all the teams. We’re very proud of what we have achieved in all areas, if you look at the car, I did not drive last year’s car but Kimi [Raikkonen] is a lot happier, with the power unit Ferrari has made the biggest step again.
"I think it’s normal that in some races things do not come together, but across the last three, four five races it’s still looking very good."
Vettel added that encouraging work has been going on behind the scenes, which has not yet been converted to on-track performance.
"Overall [it's been] very positive, starting to shape up in the background which obviously you don’t see here and you don’t see immediately on the car, but it is very promising, the project is ongoing and as I said, quite confident for the future," he said.