"My understanding with the team has really grown up a lot since the start of the season," he said. "Right now I'm in a position to always maximise the full potential of the car, exploring the car and the limits and where we set up the car trying to maximise every single little [thing.]
"We're getting very strong with my group of engineers … We have a lot of room to improve, it's only my tenth race with McLaren," he pointed out.
Asked by journalists to give his season so far a mark out of ten, Perez said "For myself, six or seven - because I have good room to improve together with the team."
Button wasn't as comfortable giving himself a score, even when pressed to do so by the reporters.
"I don't want to put a number on it," he replied. "To be fair it would be a complete guess. I mean, what does five mean, what does eight mean?
"Ten's perfect, and obviously I am but I don't want to state the obvious!" he said, drawing laugher from the crowd, before then moving on to make a more serious point.
"It should never be a ten, because we should always be willing to improve - and never think we're the best," he said.