In my earlier comparison of the points on various metal needles, I missed out the Knitpro Karbonz - although carbon fibre, they have metal tips.
To the eye, I thought the zing matched the Karbonz (both slightly rounder than the Nova, on the right) but when magnified a little bit it does look as if the Zing comes somewhere between, less sharp than the Nova, maybe a little sharper than the Karbonz
... at least with these particular ones, all 3mm.
How about the joins and cables?
I've not noticed before that the cable is a little thicker than on the Karbonz (these are both 3mm x 80cm) I'm not sure whether the extra thickness will make any noticeable difference when knitting, and whether one would be better. As for the joins (which probably look a little more scary in this extreme close-up than in real life) to the thumbnail they feel just the same. Notice there's more of a taper on the Karbonz down to the thinner cable.
Another positive with the zings is that the size is laser engraved; you can feel it with your thumbnail. The Karbonz have the size printed on, which does wear with use - as you can see from my own needle above.