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Hydraulic steering ratios (lower = sportier/more responsive)
E46 M3 (no servotronic) - 15.6
E9x M3 (servotronic/variable) - 12.5 averaged
E8x M Coupe (servotronic/variable) - 12.5 averaged
E9x 3 Series (non-M) - 16
E8x 1 Series (non-M) - 16
E84 X1 - 18.5
There doesn't seem to be any data in regards to the amount of hydraulic assistance on non servotronic vehicles (servotronic varies assistance based on vehicle speed on X1). I'm guessing that the E9x 3 series have more hydraulic assistance than the E8x 1 series based on my own driving impressions.
I drove my parents F30 328i with EPS+ (variable sport steering) again yesterday. The EPS+ system seems to be emulating the adjustable hydraulic/servotronic systems of the M vehicles (I've never driven an M), while steering is effortless when parking. I hope that this is an option on the sDrive X1 soon for those owners who don't need AWD (I believe it is available on X3).
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