Re: air zone vs custom-custom?
The Air Zone and TZ are a bit different in tone and feel. The AZ has that fatness to the highs that is VERY responsive to picking dynamics. The AZ is also more open and less "harsh" due to the "air".
I would say, and this is from past experience (NOT A/Bing) that the TZ has a fatness to the lows and a tightness that's quite nice. It's very balanced, and controlled. Like a wild PAF, but as some people say, the AZ is polite, (esp when compared to the Breed)
As the second post said, the CC is a little nasty and loose. It's got round highs, but not as responsive. All duncans have a little bite and spike when spanked in them which can be quite nicefor a rude tone. I think you really have to play with pup height and pole pieces to get the treble you want. The low end is spongy and loose, as opposed to the better tightness on the AZ. I am well aware the AZ is NOT super tight, but in comparison, it is MUCH tighter.
Both are great pups.