2014-12-28: I made an updated version available on my new blog!
As you can see in the test results below the HummingBoard performs way better than the Raspberry Pi. It also outperforms the Banana Pi quite nicely.
Currently, the only downside of the HummingBoard is its price. For a Raspberry Pi you pay only $35, for the Banana Pi you pay around $50. The price for a HummingBoard i2eX is $99.99.
Note: for the tests I used an up-to-date version of Debian Jessie.
The full report is available here.