My guess is that your buddy read a 60ft time, and not a 0-60mph time in that mag. All current bikes can run 1.8 60ft at the track stock. With some mods a Busa (and others) can get some 1.6 60ft's.
In a straight line stock to stock a busa will out run an R1 and GSXR1000, with equal riders. It has more power, and more weight over the front wheel, giving it the launching edge street or track. It also has a longer wheelbase, also good for drag racing.
I have beat a guy with a lowered, piped, mapped, geared, cammed Busa at the drag strip with my then slip-on having r1. It's all up to the rider. I have been beat by a stock R1 with my full system R1, he was a much better rider.
I raced a buddy once on the street, him on his piped and mapped busa, me on my r1. We ran it up to a bit over 180mph on my speedo, side by side. When we stopped I told him I was suprised it was so close all the way to high gear, he told me he was topped out in 5th and about to shift into 6th...lol I was amazed.
If you do a roll on in a higher gear with a Busa, say 70 mph both bikes in 5th or 6th, the R1 will kill it. Not because it's lighter or quicker, but because the gearing is so TALL on the Busa and Zx12-R.