Why do Nikon lenses show SO much purple fringing in the tests vs. Canon???

[Sheiky]

I was using the ISO 12233 Resolution Chart Comparison tool and noticed that many Nikon lenses versus their Canon equivalents show quite a bit more purple fringing at wide apertures. Like for example the Nikon 85 1.8G vs. the Canon 85 1.8. Is this a characteristic of Nikon lenses?

Interesting question, because of all the lenses I've used the Canon 85mm 1.8 probably has the most purple aberration I've seen. But I can clearly see your point when I look at the charts.