Teasing out some inferrences:
The comparison to the Intel D525 is really unfortunate, as that's a 2.5 year old, 45nm Pine Trail box with a 13W TDP. The low power 22nm Ivy Bridge cores are only 14W, so I'd really wanted to have seen a comparison to a more recent CPU.
The Exynos wipes the floor on the parallel NAS tests. I'm not sure why exactly.
The Atom core has known issues with floating point relative to desktop CPUs, and the A9 was never particularly good at it. So the FFTE results showing the A15 about 50% faster than Atom and 2x faster than A9 are a surprise. It's almost what I'd expect to see from a desktop box at that.
On the other hand, the 7-zip and x264 tests are integer dominated and largely cache-bound, and the A15 doesn't show itself off particularly well here, mostly matching the A9 and Atom per-clock. Yawn. (This is an area where all these CPUs get toasted by Ivy Bridge, btw -- remember that 14W TDP?)
The "Smallpt Global Illumination Renderer" and "C-Ray" tests (which I don't know anything about per se) shows everyone about the same (and for Smallpt 2x as fast as PandaBoard). So I'm going to guess this means the tests are DRAM-bound, and thus infer that the A15 has a similar memory bandwidth to Atom (probably 2x 32 bit vs. the Pine Trail 1x 64 bit channels). That's not great, honestly, as it's still about half of what you can get with a desktop part. But then DRAM refresh draws power, so may not have been an option for the Chromebook .