As far as comparing I think you should pay more attention to the torque specs since torque gives you your acceleration. The SR has more torque than a 600cc sport bike as does the S it looks like.
Don't forget that that discussion is complicated by the fact that ICE bikes have gearboxes, which gives them a low gear with a lot lower (higher numerically) ratio than the single fixed gear on the Zeros. So although the ENGINE may not be putting out as much torque as the motor on our bikes, because of torque multiplication in low gears, it's possible for them to put more to the ground. That's why a Hayabusa can pretty easily spin its rear tire, where an SR can't, even though the 'Busa is heavier, uses a lot wider tire and doesn't put out as much raw torque as the SR does. The Hayabusa's torque is multiplied by a (numerically) higher gear ratio before it gets to the rear wheel.
That said, the SR leaps LIVELY from standstill, can easily out-roll-on just about any vehicle on the freeway, and will just generally put a grin on your face wherever you take it. Anybody who thinks an S, let alone an SR, isn't capable of freeway performance...well, they just haven't ridden one. Your dealer needs to throw a leg over the product he sells if he wants to have any clue what he's talking about.