Shirts:
Kamakura: fit is good, nice collar roll for the most part, I think the royal oxford has a nicer collar for some reason. Fabric wise not the best when it comes to either the royal oxford or regular oxford. The broadcloth its good and i have a couple of shirts and they are all good. That being said they have a shrinking problem on the oxford ones and they are rough to iron.
Barba Napoli: i have 3 versions, white tag (slim), black tag (super slim fit) and dandy blue tag (slim fit) i have around 8 of these and they are superb both collars, fabric, and fit. Can be found relatively cheap, around as much for a kamakura but you gotta pay for the shipping.
Finamore Napoli: awesome collar roll, fit is alright not as good as barba in my opinion. Has more hand made details that Barba in the back and collar area. The designs are a bit too extreme.
Luigi Borelli Napoli: fit is harder for these, i usually have to size down on them. Fabric wise, collar roll, and hand made are far superior to the ones mentioned above. They are super easy to iron and feel almost like a second skin.
Sartoria Partenopea: I have 3 and they are very good, both fabric and fit. Not as much hand made details as barba, finamore, or luigi borelli, still good due to the price that they can be found 35 euros usually. Fabrics are still pretty good though.