I have fruits from the "FEMMINELLO SIRACUSANO 2KR LEMON" and "SFUSATO AMALFITANO" fruits.
The Sfusato Amalfitano fruit is the nornal size fruit, not the large ones you see in some of those photos in amalfi coast markets.
I don't think I can do a good job of describing the flavor, taste. But I can take a few photos to show, and maybe taste the with pith of the rind and give you feedback on if it's bitter or not. I also have fruits from the Lisbon, Eureka, Pink Lemon, Ponderosa, Var. Pink, Meyer lemon to compare it to.
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Update:
I did ask a friend who grew up in Sicily to do a taste comparison, here's his comments after tasting the three lemons (Eureka, Lisbon, and S. Amalfitano).
1. Eureka lemon: This lemon has more bitter-tart taste than either the Lisbon or the Amalfitano lemon. The taste is robust but not too sour. There is also a slight aftertaste that is less tart and more bitter.
2. Lisbon lemon: This lemon has a less tart and more bitter taste than the Eureka or Amalfitano. The taste is robust and more sour than bitter, and it has less aftertaste than the Eureka.
3. Amalfitano: This lemon has a more complex flavor than either the Eureka or the Lisbon lemons. In terms of tartness, it is tarter than either the Eureka or the Lisbon lemon. It also has more aftertaste than either the Eureka or the Lisbon lemon. The aftertaste is very pleasant and less bitter than either the Eureka or the Lisbon lemon.
4. If I were to rank the three lemons as regards to flavor when eaten raw (out of hand) I would rate them as follows;
1) Amalfitano as the most preferred
2) Lisbon
3) Eureka, least preferred