In terms of sheer entertainment, this clip from Fifth Gear judging the Lexus IS-F and the BMW M3 by how high they get a woman’s heartrate is pure dead brilliant:
A very enjoyable piece (and it’s duly noted that Tiff has to cheat at the end to get the M3 above the IS-F).
Update: Didn’t realize there was two parts to this comparison. Updated to reflect that.