Raimey,
Maybe that Scherping has a Blitz action, not an A&D.

The issue with the A&D traditional action is that the sear is mounted very close to the tumbler axis. This requires a very wide sear to reduce the working pressure and it also makes an intercepting sear a wish-able feature.
The overhanging sear is IMHO superior, because it is mounted much farther away from the axis, and therefore does not require a wide tumbler, which allows for a thinner cut in the bar, an easier sear filing, etc...
Best regards,
WC-