Even with the SDR mod on HD 800?
http://www.innerfidelity.com/content/sennheiser-hd-800-s-tweaked-and-delightfuland-french-diy-response#JC5JtkETj0FREt0r.97
How about with Oppo HA-1?
Haven't heard HD-800 with HA-1.
I haven't heard a SDR mod HD-800 with a Asgard2 but did hear a SDR mod HD-800 with a Hugo and it was good but the non-SRD HD-800 was better to me, just personal preference and how we all hear differently. I think the genre of music also has a bearing on what an individual likes, for me the SRD mod HD-800 lost some of the sound stage with classical and some of the air with jazz but with pop its quite good.