The EOS M3 is a test winner according to the German „photoMAGAZIN“ journal 06/2015.
, German only)
They were testing the Canon EOS M3, Fujifilm X-A2, Panasonic Lumix GF7 and the Samsung NX500 in categories like image quality (OOC JPEGs), speed (AF and shooting speed), features and handling.
The M3 and NX500 won a shared overall 1st place with Canon having the best IQ (!!!, OOC JPEGs) and AF speed (!!!) of the test field and the NX500 with the highest shutter speed (9/sec).
Interesting was the overall conclusion that Canon needed 2 (and a half) attempts for a good MILC (M, M2 counting half and M3) and a detailed analysis that the AF with EF-M lenses is now one of the fastest, while still struggling with EF and EF-S lenses. Good numbers are coming from a continuous AF independent of pressing the shutter or the AF mode used (don't ask me, what that means for battery life).
Shutter delay with AF in numbers (average time):
EOS M 0.8 sec
EOS M3 0.2 sec
Both with EF-M 18-55 (Canon was saying that AF would be six times faster)
EOS M3 with EF-S 18-135 STM 0.5 sec
EOS M3 with EF 24-105L IS USM 0.8 sec
STM being overall faster with EOS M than USM.
Fujifilm X-A2 0.7 sec (with 16-50 OIS II)
Panasonic Lumix GF7 0.25 sec (with G Vario 12-32)
Samsung NX500 0.25 sec (with 16-50 PZ OIS)