There had been some review out in a german IT Tabloid (chip.de) that is not that much know for its fotografic skills but does a reasonable measurement set (if you carefully interpret it)
Their measured OOC JPEG resolution was really impressive (although I would speculate that the Mini is oversharpening here nevertheless they indicated a reasonable level of measured details up to ISO1600, where typical for Samsung JPEG they heavily denoise again so that I would expect to use RAW in case I ever get one)
Regards dynamics they did measure
Dynamikumfang bei ISO min 10,0 Blendenstufen
Dynamikumfang bei ISO 400 9,0 Blendenstufen
Dynamikumfang bei ISO 800 9,0 Blendenstufen
Dynamikumfang bei ISO 1.600 9,0 Blendenstufen
Dynamikumfang bei ISO 3.200 8,3 Blendenstufen
where the Nikon "1" V3 did worse
Dynamikumfang bei ISO min 8,7 Blendenstufen
Dynamikumfang bei ISO 400 8,7 Blendenstufen
Dynamikumfang bei ISO 800 8,7 Blendenstufen
Dynamikumfang bei ISO 1.600 8,3 Blendenstufen
Dynamikumfang bei ISO 3.200 8,0 Blendenstufen
Nevertheless I would take with a grain of salt but it indicates that there is nothing wrong with the little one