The Su-57 is as advanced (apart from stealth) as the Su-35.
The main benefit of it is it will force spending onto the adversaries, to upgrade the radars/ SAM systems.
The US already started due to that the development of dual band radars : D
Not really... is worlds of difference apart! The Su-57 will be night and day difference in the capabilities of SU-35.
1)Way superior engine than Su-35.. this will allow the plane carry not only
more bigger weapons but also better combat performance ,speed and or range.
2)More advanved electronic warfare
3)Much More advanced radars.. that will be much more difficult to jam and will have higher precision
4)Much more advanced sensors to see other stealth planes..
5)It will carry much more advanced next generation missiles.. including hypersonic weapons.
something the Su-35 don't have. it will carry also bigger bombs..
so much more destruction . it can also carry more weapons if used externally missiles..
6) According to Russia Su-57 will have the ability to operate with Artificial intelligence on its own.. without a pilot , like a drone.. Su-35 will not have such features..
7)Last but no least the plane will be stealth , and will have more features to detect
and see stealth planes..
and bonus apparently some of the electronics in Su-57 will be based on Photonics..
This is something completely new ,that no other modern plane in the world have.
According to one Professor i had in electronic class.. he told me electronics will be
Obsolete in the future.. wires and all that electric current science will not apply to
technology of the future... you can't jam as easily a photonic base communications equipment as you could do with an electronic equipment .. Communications is also another place Photonics will be revolutionary.. it will be fully safe at least for a decade or more until it became mainstream and people find a way to mess with it.. and no need to secure them ,if the communications is made of photons.
This does not means that an SU-35 can't beat ever in combat an Su-57..
even a soviet mig-21 plane with a very skilled pilot ,could defeat an amateur
in a modern stealth plane.. when it comes to planes.. SKILLS and tactics will be always better than techonology....it only means the SU-57 ,will be far more capable ,to penetrate enemy defenses and have more possibilities to be successful in any kind of mission ,pilots being both equally skilled ,way more possibilities and capabilities..versus flying an Su-35..
all things said.. as good as the SU-57 could be or not..
I believe for Russia airforce.. is much much much more important a long range
tactical bombers.. than any air superiority plane..
Some Supersonic or hypersonic modern stealth bombers ,armed with kinzhall missiles for example will be more useful to counter NATO navies in case of a major conflict..
So a couple of dozens or more Mig-41's or Pak-DA will be much more useful for Russia
those 76 fighters are gonna be delivered till 2027 so I guess some can go with new engine.
They can be upgraded later the engines..with the new ones.. not a problem..
they for sure will do everything in a way ,that will be easier to replace the engines
when the new ones are ready.