RPI3 64bit Benchmark

Since there is no official 64bit Rasbian distribution for the Raspberry Pi 3, there has been a lot of discussion if a 64bit version would actually give any performance benefit.
I try to answer the question by performing BWA-0.6.2 benchmark on various kernels and distributions.
I have added a heatsink and fan to the RPI3, to allow for non-throttled performance.

Debian bootstrap is used for building and testing

debootstrap --no-check-gpg --variant=buildd --arch=armhf unstable arm32-sbuild http://ftp.debian.org/debian
debootstrap --no-check-gpg --variant=buildd --arch=arm64 unstable arm64-sbuild http://ftp.debian.org/debian

pi64: https://github.com/bamarni/pi64
openSUSE: http://download.opensuse.org/ports/aarch64/tumbleweed/images/openSUSE-Tumbleweed-ARM-XFCE-raspberrypi3.aarch64-Current.raw.xz

Dist	Kernel	Kernel-arch	Native env	32bit chroot env	64bit chroot env
Raspbian	stock	32bit	355.260		N/A
Raspbian	self-compiled	32bit
Raspbian	self-compiled	64bit
openSUSE	stock	64bit
pi64	stock	64bit