> Is it even worth switching from ARMv7 to ARMv8?

Not unless you are running a kernel and OS userland compiled for ARMv8; there are at least a few such things for the Pi 3 around, including [Fedora][1].  For some hints about why there still isn't a special version of Raspbian, see here:

https://raspberrypi.stackexchange.com/q/43921/5538



Otherwise, I think the only relevance is in what the processor reports itself as, which can be found via `/proc/cpuinfo`.  Some people use this as a means of telling one model of pi from another, although the practice is obviously not widespread.  Put another way, unless you know of a reason to do so, there isn't one.


  [1]: https://fedoraproject.org/wiki/Architectures/ARM/Raspberry_Pi#Raspberry_Pi_3_aarch64_support