I shot with all manual film SLRs for most of my life. I would use a wide angle lens, no longer than 28mm in the 135 format, set it at F5.6 or F8 and the hyperfocal distance, and not worry about focusing at all, but the new mirrorless cameras, at least the ones with articulating LCDs and touch screens, and their implementation of modern features such as focus-tracking and touch-focusing, can make AF work really well in the street. And, in terms of ISO, the new digital gizmos surpass old Tri-X 400 by several stops.