Comment by adrian_b

In general Renesas offers more modern microcontrollers than all the other vendors of MCUs, which have decreased a lot the rate of new product launches during recent years, but unfortunately they are also among the most expensive.

I have also not seen Cortex-M85 except from Renesas. Cortex-M55 is seldom an alternative to Cortex-M7, because Cortex-M55 is smaller and slower than Cortex-M7 (but faster than the old Cortex-M4 or than the newer Cortex-M33).

Cortex-M55 implements the Helium vector instruction set, so for an application that can use Helium it may match or exceed the speed of a Cortex-M7, in which case it could replace it. Cortex-M55 may also be used to upgrade an old product with Cortex-M7, if the M7 was used only because Cortex-M4 would have been too slow, but the full speed of Cortex-M7 was not really needed.