They're unfiled. The more important difference is in the cut and strength. Zonda are designed to be jazz reeds and Gonzalez classical. As such the Gonzalez are about a half strength harder i.e. a 3 Zonda is like a 2.5 Gonzalez. I use Gonzalez for jazz playing so I think you should just consider them as alternative cuts. For what it's worth I would compare Zondas to Vandoren ZZs in terms of tone and Gonzalez to Alexander DCs.
I wasn't going to make a quality judgement but I agree, Gonzalez are better than DCs and, come to that, Zondas are better than ZZs. They're similar but have more of what makes the other one what it is and the Gonzalez at least are much cheaper over here. Zondas, on the other hand, are much more expensive.
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