12v PNP- switching with MCU
The voltage divider R2-R3 doesn't hurt but normally (i.e. if the ouput is configured to drive high and low; not just low) it is not needed.

It may be needed though, if you want to the signal level at the gate of the MOSFET to be high when the MCU's output is in  high impedance state (e.g. during reset).