Hello Mr.nbrowser ,
I own the Asgard 2 , it's outstanding driving everything I own but I don't own everything . Still , any amp will need a superb or very good DAC to have your headphones singing beautifully . You will need an JDS Labs ODAC at a minimum . The DAC is a digital Phono Cartridge for playing your Computer iTunes Music .
Still , all-n-all , your MDR phones will scale up with better electronics , there is no point in trying to judge them properly unless you employ proper electronics .
I was a High-End Audio Dealer , I've owned great electronics , the Asgard 2 performs at the same level with the best I've ever owned or sold , solid state , great dynamic driver amplification . Tubes will be helpful with the Planers that love Voltage Swings and softness .
In summary , I might suggest that you may never be able to discover another Solid State headphone Amp that can significantly outperform the Schiit . The big bonus is that the darn thing is so low priced , how can a person go wrong ? , if you end up retiring it , you can keep it in a closet as a back-up against a Polar Bear smashing up your stuff . ( you do have Polar Bears , don't you ? ) I think you Canadians have them as Pets , in the back , chained up . They do make great Pets , don't they ? , that's what I've heard .
Headphones is one of the Great Hobbies , Schiit is darn good , and the Schiit Stuff sells well on ebay if you decide to sell .
Tony in Michigan