Yes you will benefit with the A6, I have the zen stream (it is okay, but compared to the a6 it sounds harsh, the A6 compared to the A8 misses smoothness and 3d stage, and I mean that digitally not analogue) If you really want to make a leap get the A8. Yes the AKM build in is very very good, but I mean as a streamer.
I know some keep on screaming a6 is the same as the A8 IT IS NOT!, I tried them all in a row. I had the A6 after a week or two got fed up, knowing the A8 sounded better and exchanged it for the A8, never looked back, a amazing machine as a streamer (digitally AND analogue). I audited all three in a row, the chord TT2+mscaler as a dac. A8 one clearly, noticable through headphones, with speaker and amp set even more.
the TT2/MScaler was set to automatic, so switching was nearly instant.