significantly different
S4 1st: 3.500, 2nd: 1.889, 3rd: 1.231, 4th: 0.967, 5th: 0.806, 6th: 0.684
A4 1st: 3.778, 2nd: 2.176, 3rd: 1.429, 4th: 1.029, 5th: 0.838
The S4 has longer gears in every gear and a significantly higher top speed potential with a lower ratio sixth.
you'll be zipping through gears like a drag racer on amphetamines.