If the iPad Air has the A14, and we know what % improvements are for CPU and GPU
Can we predict them for the new iPhones if they use the same new A series chip?
Yep, the A14 announced today should be the exact same chip that is used in the iPhone 12. Performance improvement vs the A13 will be minor and are quoted in the 10-20% range. Probably more power efficient with the 5 nm process though.
These are some of the improvements the A14 has over the A12.
These are some of the improvements the A13 has over the A12.
I'll just do some lazy math:
So basically A14 has ~+20% CPU improvement over A13 and +~10% GPU performance.
Biggest improvements definitely in the NE with it going from 8 cores to 16 cores. Probably close to ~50% improvement over the A13.