It is "Club Empress" service which is now referred to as Executive First. It is a lot better than most of US carriers' F class. Aircraft is 767-300, seating is 1-2-2 and seat pitch is about 60" on the 767. They treat HNL as an international destination instead of a US destination. If you are flying from YYZ, then I would say this is the best choice you have in J class as premium class service to HNL on US airlines are a joke.

Do Executive First seats become fully flat sleepers?

No, they don't