I'll say that comparing the HD800 and 940 isn't a fair comparison. The 940 is a closed can and sounds like it. The HD800 is open. The 940 has a mid bass hole the HD800 doesn't. The HD800 is more refined. The 940 is rough around the edges. The HD800 needs a quality amp. The 940 doesn't. The 940 does not compare to the HD800.
To be fare with the SRH-940 they are close but among the close back they have good soundstage and "rough around the edges" they are not with good source.
And for the records I could care less if they don't compare to the HD800.