They are both 11.75mm and the Lucasi is less expensive with a black Kamui soft tip. The OB has a soft hit which I personally like. Has anybody played them both?
Don't go by what tip the shaft comes with, you can change to whatever you like.
I have yet to try the new OB shafts, but the old OB2 had a soft hit to it as you describe. The Lucasi shaft feels nice, but does not deflect as much as a Z2 shaft.
Have you considered Katana Bushido, McDermott i3 and Tiger X shaft?