Fernando Alonso says it's difficult to judge who is on top in Hungary after the rain curtailed running on Friday afternoon.
Although McLaren's Lewis Hamilton set the pace in both practice sessions, the Brit's rivals didn't all take to the softer option Pirelli tyres nor were they all on track when the sweltering temperature dropped just before the rain.
As such the Spaniard, who was fifth quickest in the afternoon's session, says he has no idea what to expect come Saturday's qualifying hour.
"What's to say, the usual Friday, at the end of which it is always difficult to hypothesise on how things will go in qualifying or the race," Alonso said.
"Because of this afternoon's rain in fact, we did not manage to try the dry tyres over a long run but, at least in the morning we managed to complete the work relating to the aerodynamic updates which we brought here in Hungary.
"Now it's up to our engineers to do all the analyses to put together the best possible package for the rest of the weekend.
"Qualifying is definitely more important than elsewhere: it will therefore be vital to go into every little detail to be as well prepared as possible for Saturday.
"The unknown relating to tyres? It's the same for everyone as was the case in Silverstone and Hockenheim!"
Alonso, the only driver to have won three races already this season, arrived in Hungary leading the Drivers' Championship by 34 points over Mark Webber.