What sort of performance informtion are you after? Comparing a 4 engine aeroplane with a 2 engine aeroplane or more specifically the B777 with the A340?
The twin will have more excess power in just about every case (excluding Concorde and mil jets of course!). You'll find the take-off performance and climb performance is better on the B777, especially if you're looking at comparing it with the original A340s.