If N1K2 ever amazed american pilots with its toughness, I am very amazed.
It takes more hits than P-47, which I *thought* to be tough.
Few MG hits in wing and byebye for P-47, but N1K2 keeps flying even after cannon hits in wing.
Spitfires are either tough or easy to shoot down.
Weakest spot of Spitfrie is horizontal stab - if you hit it, it will go down probably with just one 20mm hit.
It's fuselage / wing areas are horribly strong. (wing toughness comparable to P-47s.. AH ones)
I don't see much trouble downing 109s.
Engine usually starts smoking after hit or two
(and you know that smoking 109 is shortly finished 109, unlike many other planes)