Well, Car & Driver just tested the LFA
http://www.caranddriver.com/reviews/car/10q1/world_exclusive!_2012_lexus_lfa_tested-short_take_road_test
VEHICLE TYPE: front-engine, rear-wheel-drive, 2-passenger, 2-door coupe
ESTIMATED PRICE AS TESTED: $375,000 (estimated base price: $375,000)
ENGINE TYPE: DOHC 40-valve V-10, aluminum block and heads, port fuel injection
Displacement: 293 cu in, 4805cc
Power (SAE net): 553 bhp @ 8700 rpm
Torque (SAE net): 354 lb-ft @ 6800 rpm
TRANSMISSION: 6-speed manual with automated shifting and clutch
DIMENSIONS:
Wheelbase: 102.6 in
Length: 177.4 in
Width: 74.6 in
Height: 48.0 in
Curb weight: 3583 lb
PERFORMANCE:
Zero to 60 mph: 3.7 sec
Zero to 100 mph: 7.8 sec
Zero to 130 mph: 12.9 sec
Zero to 150 mph: 18.3 sec
Standing ¼-mile: 11.8 sec @ 124 mph
Top speed (drag limited): 202 mph
Braking, 70–0 mph: 156 ft
Roadholding, 200-ft-dia skidpad: 1.00 g
FUEL ECONOMY:
EPA city/highway driving: 14/20 mpg
Thus far, it looks like performance is pretty much on par, if not a little shy, of the Z06. Except for fuel economy, Z06 clearly beats it there.