The new A12Z SoC manages to impress us in a negative way. We were suspecting it would not be that much faster than the A12X, but we would have never guessed that it only has a 1% edge over the 2018 model. Still, the performance is well above anything available from the competitors, yet it does not necessarily recommend it as a worthy upgrade since Apple will release even better models in 6 months.
https://www.notebookcheck.net/Apple-s-iPad-Pro-2020-A12Z-Bionic-SoC-shows-minimal-improvements-over-the-2018-A12X-model-in-latest-AnTuTu-benchmarks.458512.0.html