Apparently both the e82 128i and 135i have servotronic assist standard. My observations on differences is steering vs E90 335i must be more due to vehicle size/weight and perhaps a corresponding difference in amount of servotronic assist. I haven't test driven the x35i, only the x28i with no servo. My wife liked the non-servo feel and said she didn't need any assist added.
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Past: E36 325i, E39 540i, F46 323i (AA tuned), E82 3.0NA, E84/F30 N20 BMS Stage 1, E70 X5 N55, F06 N55
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