Raikkonen finished down in fourth, however, almost half a second off pole and three tenths behind teammate Sebastian Vettel.
Raikkonen conceded the supersoft tyres, which have given teams a headache this weekend, continued to pose a challenge for Ferrari, and he highlighted the thinner tread being used this weekend as a possible factor.
"In 2009, we went, 'Let's go less aerodynamics and better racing, ' and in fact I think it didn't change too much", Vettel said.
"On one side people say let's wait to 2021. We though the Super Soft was the better tyre for us and it worked, bit it was still marginal the gains we made".
"It wasn't bad but we needed more laps".
"I find it a bit comical". I didn't have a great feeling on the tires, which have been different the whole weekend.
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Should the pair stay healthy and should the Sixers continue to build on their success in the right way, the Sixers should have a bright, competitive future.
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Hamilton's fourth pole in Spain - his third straight - confirms that his Mercedes auto is a strong package when it can put the tyres in the right operating window, but the Briton said he was taking nothing for granted with the chasing pack behind him. We are not engineers but in the end of the day we are the ones that know what's going on in a racing situation, so fore sure, we should be, I guess, consulted about it.
But Hamilton also believes he could have been too harsh on himself following the last race, questioning Vettel's "mistake" when his title rival attempted an overtake. In agreement with the FIA, a decision was made to reduce the thickness of the tyres for the Spanish, French and British Grands Prix - a decision that appears to be sparking some controversy after the first use of the thinner tread tyres. However, due to the high aerodynamic downforce on the cars, it is hard to follow, which has limited overtaking opportunities at certain circuits. "I didn't have much to lose so I thought I'd try".
"We should make the decisions", smiled Hamilton. I don't know. It is what it is. "We'll try to make a good start and see how the race pans out". With the laps we put in I thought we would be more like a couple of tenths from pole, not six or seven, as our auto didn't feel too bad which is a little frustrating.
"In terms of race pace we should all be the same", he explained "I don't think you can make out a favourite".
"I think we need to admit that they were just a bit quicker today", said the Ferrari driver.
"The regulations have been rushed through, a lot of them are in conflict with existing regulations, so there's going to be a meeting on Sunday to tidy it up, whether that's achievable or not". "But we're not really asked".