My understanding is that 2-door 335is (E92s) have the servo- steering and the sedans (E90s) have the traditional hydraulic. I have an 07 sedan which I think has excellent steering in feel, weighting, precision - even the wheel is a perfect diameter, thickness, and texture. Based upon ALL the negative press about the M3's steering and all the positive press about the 335i's steering you really have to wonder why they spend all the time and money re-engineering the M3's!!
Driving sideways: It's not faster, but damn it's more fun!