Where are you getting your information?
Car and Driver
Motor Trend
They go on and on like that...
It's a great first try for Lexus but... just kind of falls short.
IS-F
Gimmick Rating: 10
Driving Rating: 7.5
Those actually don't connect to anything
And the C63 is a handling mess. Just take a look at Top Gears Comparison.
http://www.youtube.com/watch?v=usQi1peqQOs
http://www.youtube.com/watch?v=g5nzEax87lw&feature=related