I lfeel that the M20s and N805s are both excellent at the 2K price point. Both benefit from quality stands. After listening to both, I preferred the 805s with the excellent dedicated Sound Anchor stands. However, the 805s will easily reveal any upstream problems. They also like a powerful, high current amplifier. IMO, a listener with very high quality(and musical) components will prefer the 805s for classic jazz, vocal, and classical music. Removing the grills will add an extra measure of clarity.
Best Wishes.
Best Wishes.