Well guys let's put it into perspective.
4.2 is 'quick' but it's not really fast. Let me explain.
The manufacturers are still addressing 0-60 times because that's what people know. Unfortunately it doesn't mean much in the real world. A GT350 does 0-60 SLOWER than a golf R, but at the end of 400m it gets there about a second quicker and is traveling 10mph faster.
This isn't a fair comparison but it illustrates my point.
Cars can do 4 second sprints these days because they're engineered to excel at certain parameters. I had a turbo D-series civic I built. It did 0-60 in probably 5.5+ but I managed a 13.7@103. Not too far behind the golf R, especially the manual model (apples and such).