so I think that at Sasuke's current level (non-curse), he is weaker than the 4 sound nins. If the Curse Seal boost your power up a certain amount, that means Sasuke will be around the same level as them. However,
Seeing some of Sasuke's fights, he doesn't have many long range attacks, so Neji probably will win but get badly hurt.I don't know how effective Chidori and Sharingan will be. At Curse Lvl 2 Sasuke will probably be able to use Chidori more times a day though.