Germany seems a very competitive civ right now with this Patch, but Japan..well IMO this Civ still a UP, yes the trait gives you culture on Fishing boats and atolls but how many sea resources you usually got when founding your Capital? 2? 3? lucky if you have 4 or 5. and the atolls, well its less likely sea features you could encounter in your start. The Samurai's new build which allow it to build fishing boats is good, but will you wait to research steel to have your samurai build those fishing boats? usually that you build those improvement when you finish building granary, shrine, watermill , some units and wonders. Also this would allow AI Japan found Cities near atolls and sea resources which for sure is far aways from thier Capital, this would make AI Japan weak, you know scattered Cities, Scattered Army, Scattered Force, Scattered Chance of being a Competent Civ.
The Zero's been improved with this patch but still, its not a good UU, only in rare occasions you create an Army of Zero and most of the time its just there in your city intercepting enemy planes.
I love Japan, I love the color, the Samurai attack animation, the Bushido , but come on they deserved better.
I suggest a new UA, UB and some improvement.
some people before said that this is overpowered, but this one, i balance it a little.
UA:
Sakoku or
Isolation - In times of war Japan gains

Gold half the amount of

Food or

Production from trade routes it sends within its Empire.(what i mean is, if Osaka send +8

production/

food to Kyoto, an additional +4

gold also would be gain from it.)
(Who cares if you embargo me??)
And if you think it would be overpowered trade routes, maybe Japan could create only half the available number of trade routes to be its internal trade routes. Also in times of war all Caravans, Cargo ship Japan send to other Civ/CS will be brought back to its origin City.
UU:
Samurai - Replace Longswordsman, same but improve
promotion: Great Generals II, Bushido(unit fight as full strength even though when damage)
(the Bushido is been removed as UA but it still there in presence of Samurai, just like what happen to France in BNW)
UB:
Dojo - Replace Barracks
Gains (x) amount of

culture everytime a unit is been trained/built in a city where the Dojo is present.
(x) = Trained unit's combat strength
ex.
Warrior

8
gain culture would be 8
or if overpowered, . .
(x) = Trained unit's combat strength / 2
ex.
Warrior

8
gain culture when trained 4
This would make Japan a real warmongering Civ while being cultural too.