We know the Raspberry Pi 2 is faster on paper. If you're curious about benchmark scores, Hackaday ran the Pi 2 through its paces and compared it to the Model B+.
Just using the Raspberry Pi 2 feels a lot faster, but if you want to see actual numbers, Hackaday ran through a bunch of benchmarking tests, including Double Precision Linpack, Dhrystone and OpenGL. On top of comparing it to the Model B+, the site also compared the Raspberry Pi 2 to the BeagleBone Black. The conclusion is pretty much the same as ours:
The original Raspberry Pi was an interesting educational tool, but it was not a usable computer. I used a Raspi 1 as a workbench computer for about a week. It was slow, and it was terrible. The Raspberry Pi 2 is perfectly usable as a small, cheap and portable desktop system, and the added power opens up a few doors on what's is possible with a [cheap] computer.
Head over to Hackaday for all the specifics.
Benchmarking the Raspberry Pi 2 [Hackaday]