If we want to be super accurate as of now as in not talking about future air to air missile loadouts, but the present here you go.
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(1709) Su-57 Stealth Fighter: News #6 - Page 9 (russiadefence.net)
https://www.russiadefence.net/t7978p200-su-57-stealth-fighter-news-6
In current configuration Su-57 carry 4 medium/long range AAM + 2 short range AAM internally
F-35 carry 4 medium/long range AAM
F-22 carry 6 medium/long range AAM +2 short range AAM
J-20 carry 4 medium/long range AAM + 2 short range AAM
So Su-57 doesn't carry more missile than its counterpart
If we are talking about the future with newer generation air to air missiles than a 8 air to air missile loadout is possible as much as the F-35 getting a 6 air to air missile configuration.
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With folding wings(assuming the new air to air missiles are this)
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latest news on Su-57 weapons.
KTRV launched mass production of new generation corrected aerial bombs (topwar.ru)
KTRV launched mass production of new generation corrected aerial bombs
The Tactical Missile Armament Corporation has completed testing of new-generation gliding ammunition and has begun their serial production. Boris Obnosov, the general director of KTRV, told about this in an interview with the "Military-Industrial Courier".
According to the head of the company, last year KTRV completed work on gliding ammunition of 250, 500 and 1500 kg caliber, launching the serial production of new generation corrected aerial bombs. The company has signed long-term contracts for the supply of a new generation of ammunition to the Russian Aerospace Forces, bombs are already entering service with the Russian military aviation .
We have made very serious progress in the past year in the production of precisely corrected aerial bombs of the KAB series. Both in their quality and quantity. The tests of a new generation of planning ammunition of calibers 250, 500 and 1500 kilograms have been completed, long-term contracts have been concluded for their supply - said Obnosov.
The general director of KTRV also said that tests of the promising KAB-250LG-E with a laser homing head and high-explosive fragmentation warhead, as well as other ammunition developed for the fifth generation Su-57 fighter, are proceeding according to schedule. In addition, at the final stage of testing are new UPAB caliber 500 and 1500 kilograms with a television guidance head.
The head of KTRV announced the completion of work and obtaining permission for serial production of a new adjustable aerial bomb of 250 kg caliber at the end of last summer. At the same time, he promised that by the end of 2020 the company will complete three topics on air-to-air missiles, on corrected air bombs of 1500 and 500 kg, on air-to-surface products and several more projects
In future configuration (not counting SACM and Cuda like things on US aircraft)
Su-57 carry 6 medium/long range AAM + 2 short range AAM
F-35 carry 6 medium/long range AAM
F-22 carry 6 medium/long range AAM + 2 short range AAM
J-20 carry 6 medium/long range AAM + 2 short range AAM
So again, Su-57 still doesn't carry more missiles than its counterpart F-22 and J-20 . Sure it can carry 2 more short range missile compared to F-35, but that is not even remotely close to the claimed 250% of F-35 load out as mentioned in the article