Jared's tests
here seem to confirm the RP sensor being the same as that of the 6D II. Already knew the R sensor is the same as 5D IV's.
Linear RAW development in ACR, no NR (if this makes sense in ACR) and no unsharp mask:

100% crops with shadows linearly lifted:

The R can handle the scene, the 6D II and RP can't.
Regards