I actually owned AK when I bought DM12, but I find DM12 superior as a polysynth. There is nothing wrong with the build quality in my DM12 unit either. I ended up trading my AK for A4 as I prefer the 49 keys.
I think it sounds good without effects too - though I don’t see anything wrong with using effects either and the effects section is pretty great in DM12.
Btw, nice trick for getting classic two oscillator saw sound in DM12 is to modulate the second unison voice some semitones lower. Combine that with slight oscillator drift and it certainly sounds fat to me.