Haven't gotten to the frame coverage test yet, but just finished testing the wink light, extended zoom and the catchlight.
It was rather interesting to compare pictures side-by-side. I've selected 15 images to show the differences in lighting:
Metz 58 testHere is, for example, how close the wink light and cathchlight card can come (ceiling bounce):
The catchlight card can go lighter (shadow wise) then this, but the wink light cannot. The image above (right) was taken at the minimum wink light power from 6 feet.
And the extended zoom... I don't really find it to be useful.