Iconic Brands Inc (ICNB)

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The entire Italian wine industry say DOCG is better quality and taste than DOC? Source please.

I've found nothing that directly compares the taste/quality of the two. According to the Italian governing body that certifies, it's about region and method.

Denominazione di Origine Controllata e Garantita (DOCG):
All wine featuring this on the label must adhere to the strictest rules and regulations, set forth to promote both consistency and quality of product. As of this writing, there are only 74 wines that have earned DOCG status.
Denominazione di Origine Controllata (DOC):
The second classification is DOC. Any bottles of wine with this designation is still within the appellation system and must be scrutinized for quality assurance, but regulations tend to be a bit more loose than with DOCG wines. At the time of publication, there are only 329 wines that have earned DOC status.