Bernsie,
I just checked an out of the pack Zwicky delta which in my opinion is not sharpened at all, more like coarsely ground. The factory bevel as near as I can tell with my protractor is 25 degrees.
The Magnus reads about 26 or 27 degrees and is only slightly sharper than the Zwicky.
Either of these angles are excellent choices because, once finsh sharpened and polished they will stay sharp much longer than a lower angle grind like 20 or 22 degrees.
The Magnus should be easier to sharpen because the edge is already straight while the Delta's blades are actually slightly concave out of the pack. You'll have to remove more steel from the Zwicky on the initial sharpening to get the blades straight.
-Sharps