Alternatively, photograph at low shutter speed, convert to monochrome, and call it art!
As for shutter lag, mirrored vs. mirrorless...finger lag is the largest component in a missed shot. That being said, turning off AF is most effective. Removing the mirror from the equation may help some, but it depends on the mirrorless camera and whether the shutter is mechanical or electronic. A non-reflex camera (no TTL viewfinder or mirror locked up) using manual focus is probably the fastest option in terms of sheer responsiveness.
Steve
Last edited by stevebrot; 02-04-2016 at 09:42 AM.