There's a write up on the IS350 in the Motoring section in the WA paper. "Champagne pace on a beer budget"
Summary: IS350 kicks ass :)
Audi A4 3.2 FSI Quyattro 6.4s 0-100 = $87,000
S4 5.1 sec = $115,000
Mercedes C300 = 7.2sec = $85,900
C63 AMG 4.8sec $144.365
IS 350: 0-100 5.6sec (matches BMW 335i M sport but $46,000 cheaper), 9.4L / 100km
IS 350 price range: 233kW $64,800 Prestige - $81,300 Sports Luxury
IS 250 price range: 153kW - $55,800 - $76,000
IS 250C: $79,000 - $99,900