I doubt a bit, for any modern car to have 50/50 bias. All cars shift weight to front when braking, so default bias should be shifted more to front. Though probably not completely to THE best bias, but to work well with electronic nannies, like stability control/traction control. Different area pistons, pad shape/area/distance from center, even stock bias is far from 50/50 split. For example charts from
here or
here, with ratio 1.8-(stock 2.3)-2.8 / to 1.