It's fine that you really like m17 and dx320 'maybe he kann max better and maybe less good,IMHO opinion I dont think it can hold ground against DX320 but you will tell me am I right or wrong.
That's not the point here at all.
No one thinks it's the best in the world, just have fun and that's it.
For my ears the kann max is great, and it does not add that there is another player beter/ less good, what is also that it is not sure that indeed the m17 / dx320 is better. I saw in one of the reviews that she preferred kann max over dx320 (in the end only my ears will determine ...)
If it's just to know if it's worth you to buy the kann max after you have m17 it's something else.
Apologies for the broken English.