"It's been a very hot day and overall a quite positive day," said Valtteri.
"In FP1, we ran in the end on the Soft tyres when others were using the HyperSofts or UltraSofts and we knew how much we'd improve on the other compounds. So FP1 already looked a bit better than last year. In FP2, both Ferrari and Red Bull looked very quick, but we were not far off.
"The car has been improved massively in the high-downforce trim. It is much quicker, even compared to the beginning of the season.
"The fast cars also make it more challenging - the quicker you go, the more G forces you have to pull. It's especially tough around this track as it is so hot - it's a bit like doing exercise in a cockpit that's 60 degrees hot.
"We made big changes from FP1 to FP2, not all of which were positive, so we'll work on this overnight. It's extremely difficult to get the balance perfectly right on this circuit, there's such a wide range of corners, so we have a lot of work to do.
"I think we have a lot of possibilities for a good result this weekend, but we need to get the car absolutely right to challenge Ferrari and Red Bull.
"I didn't get a really good lap together, but it seemed like the pace was there, so hopefully it's going to be a really close qualifying tomorrow."