Power to weight ratio is one factor, but another key factor for 0 to 60 mph of a motorcycle versus a front or rear wheel drive car is the motorcycle's relatively high center of mass means that more weight is transferred to the rear tire, or all of the weight in the case of a wheelie, which in turn allows for more relative friction at the driven wheel, typically resulting in over 1 g of acceleration on higher end motorcycles.
The situation may have changed with some all wheel drive hybrid cars like the Tesla Model S P100D, with a launch controlled acceleration of 0 to 60 mph in 2.5 seconds, provided there's enough traction (probably a drag racing track with VHT is needed). The Ferrari LaFerari takes 2.4 seconds and the Porsche 918 Spyder 2.2 seconds. This matches or exceeds the fastest bikes with the best riders hunched down over the tank to reduce the wheelie factor. 234
Some bike testing is done with the front end strapped down and the rear shocks set to max stiffness and height or locked into position.
In a street situation, it seems unlikely that even with smooth torque applied by the electric motors to all 4 wheels, there simply won't be enough traction for the cars to achieve sub 3 second 0 to 60 mph times.
However, once past 60 mph, or more like 80 mph, since that's 1st gear on the high end bikes, the bike accelerate harder than almost all cars, due to power to weight ratio.
As for the bikes, the high end bikes are around 200 hp now (Ducati V4R is 230 hp with optional exhaust), but due to wheelie factor, 0 to 60 mph times haven't improved much, stuck at around 2.5 to 2.6 seconds. For example the 175 hp first generation Suzuki Hayabusa matches the 0 to 60 mph time of the 200 hp current ZX-14R, which is 40 lbs heavier, and possibly with a center of mass that is further back and/or higher. The ZX-14R is about 0.25 second quicker than the Busa in a 1/4 mile run (9.5 versus 9.75 with a pro rider on a good track). 234