I own both and the M2 is much faster, given enough light, than the M1 - seems about 1/4 the time. And the AF is spot on. I now depend on it a lot because it is much faster.
I thought that they are sharing the same technology- The Dual Pixel CMOS AF . So I understand c100mk2 has much more reliable AF ?. Is that because of better processor ?
I own the MKI and have shot with the MKII, MKII is better, faster, has face detection, etc. Next gen tech. And then the C300 MKII comes along with even better!