Yes, I have owned the GR and GC IC at the same time (and also GR, GC, and Hexlink Golden 5C speaker cables). I had a slight preference for the GC IC in my system. The GR IC was very good (perhaps more clear and balanced overall), but the GC added more fullness a more liquid sound, and I didn't find the highs to be rolled off (or not to a noticeably detrimental level, IME).
This was in a system with a Simaudio CD player and integrated amplifier, so I suspect that YMMV with tubes or different SS equipment. I only mentioned the GC/GR because AZ was recommended, which I have also used and am familiar with. That, and the comment to steer away from Cardas, because I find some elements of AZ and Cardas to be similar, yet in other aspects not at all.
The AP solo crystal IC and SC are also very good, and I've also owned both, as well as Oval 9 and 12 SC.