The Canon 6D turned in fast startup and shut-down times ... but your subject may not be in focus in that mode. Manual focus shutter lag was quite fast, though, at 0.074 second.
The Canon 6D is available body-only, or bundled with the EF 24-105mm f/4L IS USM "kit" lens. The test images shown on most other pages of this review were taken with very sharp references lenses ...