This was the C&D results back in 2003 when they tested the RS6, E55, e39M5, and Jaguar S type-R.
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Originally Posted by C&D
First Place
2003 Audi RS 6
One of the time-honored rationales for corporate motorsports programs is technology transfer, in which systems developed and tested in racing cars find their way into street models. Thus, Audi presents the RS 6 as a legacy of the all-conquering R8 racers, winners of the 24-hour Le Mans race in 2000, ’01, and ’02. That’s a stretch. Aside from its turbo V-8, the RS 6 has as much in common with the R8 as it does with the Graf Zeppelin. But if that’s Audi’s story, it’s okay with us, because the RS 6 goes way beyond okay.
We should also acknowledge where it doesn’t go: It doesn’t go faster than the E55. With twin turbos and intercoolers, this is the most potent iteration of Audi’s 4.2-liter DOHC 40-valve V-8—450 horsepower, 415 pound-feet of torque. The torque is particularly impressive. It’s all on tap by 1950 rpm—barely off idle—and it continues at peak output all the way to 5700 rpm, a curve similar to the topography of southeast Michigan, i.e., broad and flat.
Instant torque and all-wheel drive conspire to hammer this big car to 60 mph in 4.4 seconds, just a 10th shy of the bodacious Benz, and its departure is remarkably free of drama. The small-block-Chevy rap of its twin exhausts— delightfully brash in a car of this caliber—climbs the decibel scale, the RS 6 hunkers down on its haunches, and suddenly, it’s gone, diminishing rapidly into the Arizona sunset. The speedo hits 100 mph in 10.7 seconds, and the quarter-mile comes up in 12.8 seconds at 108 mph.
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This was the comparison test C&D did last year between the M5, E63, and S6.
http://www.caranddriver.com/comparis...z-e63-amg.html
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Would you be surprised to hear that this doesn’t have a positive effect on acceleration? Or lap times on the Streets of Willow? Or making a hot exit from a slow corner? Of course you wouldn’t. Because that’s precisely what happens. This M5 was a half-second slower to 60 mph than the SMG version we tested in January 2006 — 4.7 versus 4.2 — and a half-second slower through the quarter-mile: 13.0 seconds at 114 mph versus 12.5 at 118. DSC also inhibited lane-change performance (60.8 mph versus 65.6) and skidpad results (0.83 lateral g versus 0.89).
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Here are the test results in pdf.
http://www.caranddriver.com/assets/d...ertrain_ss.pdf
The point i'm getting at is, if you look at the performance results with the older RS6 model with 450hp TT V8, i don't think the new RS6 with 580hp V10 would have any problem beating those numbers by a whole lot considering the weight is very close. And would probably at least match the M5's performance figures as well if not beat it. Obviously this are all speculation base on the given data, we'll have to wait and see the actual comparison test to be able to determine how they really stack up against each other. But also keep in mind that supposedly BMW is already testing a Twin Turbo M5.