Avanti1960,
I haven't heard an Ortofon cartridge but I can say that in comparing the Dynavector 17D3 to the ART9, I found that the tonal balance shifted from a slight emphasis in the lowest bass output (~80Hz and lower) to a more balanced bass output. I found that with the 17D3 I had to lower the volume levels on my subwoofers to keep the bass in correct balance with the upper bass and mid-range. With the ART9 I increased the volume levels of the subs a bit to have the correct balance. That and I noticed more control of the total range of bass frequencies with the ART9; there was a better rendition of acoustic bass guitar plucks, deep percussion drum thumps, and the full tone of electric bass guitar notes. The 17D3 wasn't quite as articulate.
The differences weren't dramatic, but if you were listening to the bass lines and drum thumps and paying attention to the overall tonal balance, I found the ART9 to be a better cartridge in my system.
My turntable and tonearm combination (Gyro SE/SME 309) has been described as being slightly dark but I think it's a matter of system compatibility/synergy and room acoustics more than a particular component. That said, I really am enjoying the ART9 in my vinyl setup.
Regards,
Tom