According to what I have read about this cartridge, it has an elliptical stylus which doesn't work very well for CD-4. Perhaps some other forum members have real world experience with this unit in CD-4 and can share their experiences.
I guess if the actual frequency response performance is what Grado claims and the separation is adequate up in the ultra sonic range, it should be OK for CD-4.
My only concern would be required VTF and possible increased record wear using an elliptical stylus at that force.
What is the tracking force range for that cartridge?
I use the Grado Gold on a Pioneer PL-L800 feeding a Sansui QRX9001 and the performance is excellent. This is the only setup I have used for CD-4, so my experience may subjective. It sounds good to me.