So I had a chance to do some A/B today with the AK300 and QPR1. Sound wise I think the M2Pro compares very well to both! The QPR1 sounds a little airier but the UI and controls are very frustrating IMO. I found navigating much easier on the M2Pro. I do prefer the touchscreen controls and UI on the AK300 rather than the M2Pro's capacitive buttons but thought they both sound quite similar.
I also got to test the M2Pro with the UM 3DD-Ti, Lark Studio LSX and Earsonics EM10 (awful universal shell!) and am happy to say it's very transparent and has great dynamics. It has a very black background with no discernible hiss, even on medium gain. I'd say my favourite pairings so far are the EM10 and IE800S.
I also got to test the M2Pro with the UM 3DD-Ti, Lark Studio LSX and Earsonics EM10 (awful universal shell!) and am happy to say it's very transparent and has great dynamics. It has a very black background with no discernible hiss, even on medium gain. I'd say my favourite pairings so far are the EM10 and IE800S.