Originally Posted by swamp2
As others have posted perhaps not quite at succinctly, the likely power to weight (weight to power...) ratios are:
3550/450 = 7.9 lb/hp
3850/480 = 8.0 lb/hp
That is less than a 2% difference. The 300 lb will give the M4 some significant handling and braking advantages. My prediction is that the cars will be basically a drivers race in a straight line. However, pretty well all of the journalists test metrics will have the M4 edging out the RC-F. The margin of victory will be wider on anything twisty.
But will the journalist come back and say despite being slower, the lexus is more enjoyable or rewarding to drive because of X (better steering, throttle response, engine noise etc). That is what I am more interested in than numbers. I guess we'll find out shortly.