Actually the Audi S4 lease is not bad ANYMORE. My 335i lease will be over in march and I just ordered an S4: 300 over invoice, 0.00144 MF and 54% residual. On a 55,000 MSRP S4, I'm paying slightly less than what my friend is paying for his recently leased, similarly priced E92 335i.
After test driving the S4, i thought the car was impressive but it wasn't a instant winner. the handling wasn't better than my 335. I thought overall Audi did a pretty good job. The sports differential feature is pretty impressive and so is dual clutch 7 speed auto transmission.
Why did pick S4 over E90 335i? I was looking for something *NEW*. New for me and the market. I enjoyed my 335i coupe for 3 years. got it few months after it came out. I need to get a 4 door now and E90 is just a little old. I lease my cars so why not drive something different for next 3 years. I will switch back when the F30 will be out