jjs wrote:

Sharpness is in the lens. It doesn't matter what shutter you use. [...]

That doesn't quite tally with the rest of what you wrote, i.e. that shutter
caused vibration can indeed reduce sharpness.

One other thing to consider is that SLR cameras using leaf shutter lenses
must have a second "shutter" to shield the film while viewing through the
open leaf shutter. That thing too will cause vibrations, so it's design too
will matter very much.
In some SLRs using leaf shutter lenses, this extra shutter even is a focal
plane shutter.

Use of a tripod and prereleasing the camera is the only way to benefit from
the relative lack of shutter induced vibration associated with use of leaf
shutters.
(And anyway, use of a tripod is far more important than choice of shutter
type.)