I don't quite see the special thing about the 135, though? Nikon has had excellent lenses in that range for a long time (105/2.5, the AF 105/2 and 135/2), I think almost every lens maker does.
No, that's chroma aberration(of which longitudinal is a type), the Canon 100/2 exhibits the exact same purple fringing on high contrast areas. I know because it's what I moved from when I got my 135L.
If that was out of focus you'd see a clean transition from black->grey on the edges and a lot more of the detail would be lost.
Also, the 135 DC looks like it has really poor chroma aberration[1].
[1] https://www.the-digital-picture.com/Reviews/ISO-12233-Sample...