The Mini 5 has leaked and is carrying a 1" sensor. So that means the sensor on the mini 5 will be better then the two secondary cameras on the Mavic 4 Pro?
Looking purely at sensor size that would be correct, the Mavic 4 tele lenses use a 1/1.3in (same as the Mini 3/Mini 4) and a 1/1.5in sensor both of which are smaller than a 1in sensor.
However I don't really see the point in comparing the tele lenses on the Mavic 4 to the wide angle sensor on the Mini 5. The equivalent lens on the Mavic 4 is a 4/3 sensor and also has variable aperture which the previous MIni's lacked, also the Mini 5 lens may not be great if they've had to make compromises to fit the bigger sensor into a small package which could impact the image quality.
I hate this sensor naming system....I really wish there was something better by now.