Nothing in this game can out-turn the A6M2. Nothing. That doesn't mean that you can't out-fly its pilot.
So,
Here's my list of turnfighters:
A6M2
D3A Val
SBD-5
FM-2/A6M5 (tie)
F4F-4/Hurricane I (tie)
Hurricane IIC
SpitI
SpitV/Seafire II
Bf 109F4
Bf 109E
SpitfireIX
N1K2
Ki-61
F6F-5
SpitXIV
P-40B
P-40E
Yak-9U
Yak-9T
P-38L
My regards,
Widewing