My understanding on this fine - it is a pet subject.
*All* cartridges produce tracking and tracing distortions and there are no exceptions. The only way to minimise the tracing distortions is to use a stylus with an ultra fine scanning radius of around 2.5-3um, or as close as you can get to the cutter.
I hear distortions from all elliptical tips, let alone conicals and the same goes for many extended profiles, which still leave the minor radius too large. Good set up and arm choice does not eliminate the problem which is one of the stylus being unable to trace short wavelengths.
If you doubt this, just look at the distortion produced by most phono cartridges - including Deccas - and you'll see >10% thd at HF - yes 10%.
Now if you are saying that is ok then fine, but I want better, and you can get better.
I never buy a cartridge unless it carries a top class Gyger, VDH or ML tip - if the stylus is incapable of tracing the groove then it doesn't matter how good the rest of the cartridge is. I make exceptions for low priced cartridges but even then you should insist on a special swept elliptical as on the Denon 110 as a minimum.