We have already done a specification comparison review between these camera, now its time for HIGH ISO TEST, take a look below
Both camera showing almost same Image quality but if we look closely the image quality of RX100 M2 is bit better since the M2 since it have bit (F1.8 vs F2.8) better aperture at wide end. Hence the RX100 M2 sensor get more light compared to RX10.
Also see specification comparison review here
Buy Sony RX10 from Amazon || Buy Sony RX100 M2 from Amazon
image credit -imagine resource