Cathay puts their First Class passengers in the BA First Class lounge at JFK. Note that BA First Class passengers actually use the Concorde Room, not this lounge.
On the whole, this lounge is 'meh'. It's a good business class lounge, but is not fit for First Class. Their food offerings were sparse, mostly fruit and some stale sushi, and they had no hot food. The liquor selection was decent, with Grey Goose and Laurent-Perrier on offer.