On 20 January 2021, the General Court of the European Union re-ruled in Case T-328/17.
In this case the Court of Justice of the European Union in both instances consider the issue of the collective marks distinctiveness and come to the conclusion that it cannot be assessed in a specific way only on the ground that the mark is collective.
The judgment can be found here: http://curia.europa.eu/juris/documents.jsf?num=T-328/17