Benchmarks Of The $5 Raspberry Pi Zero
To no surprise, the Raspberry Pi 2 is multiple times faster than the Raspberry Pi Zero... While the Pi Zero has just a 1GHz single-core processor, the Raspberry Pi 2 is a 900MHz quad-core Cortex-A7 design. The Raspberry Pi 2 also has double the amount of system memory.
The top-end ARM development board right now is the NVIDIA Jetson TX1 with Tegra X1 64-bit SoC. It's interesting nevertheless seeing how this $5 ARM board stacks up.