Cars have better aerodynamics and a lot more down force than bikes which allows them to carry higher cornering speeds. Lap times don't lie. Jan Magnusson's Corvette C6R ran a 1:19.291 at Laguna Seca in 2008 while Casey Stoner when he was still with Ducati's MotoGP bike ran a 1:20.700. Keep in mind that it's just a heavily modded production Corvette vs a full out race-spec prototype MotoGP bike and the bike still lost. Formula 1 cars will pretty much destroy MotoGP bikes in all aspects of racing (straight away, cornering speed, corner exit speed etc). If you compare modded production cars vs modded production bikes, any GT car in FIA endurance championship series will beat any world superbike.
But none of this matters to us anyways since none of us are professional racers/riders and can't take these vehicles to anywhere near their limits. But if you guys really want to compare the potential of bikes vs cars, there is no contest, car will own bikes in the hands of a professional driver. If you take the current "best driver" and "best rider" in the world which is arguable Sebastian Vettel in F1 and Jorge Lorenzo in MotoGP respectively and hand Vettel a stock Nissan GT-R, he will most likely beat Lorenzo on a whatever stock 1000cc bike (1199 Panigale, RSV4 Factory, BMW S1000RR, etc) on a track.
Anyways, the Korean Grand Prix today was pretty awesome! Vettel taking the win again! He is probably the only guy that has a chance of surpassing Michael Schumacher's records lol. Hope he wins this season and take his third straight F1 champion!