A good friend of mine just picked up the K812 and the astell&kern and he told me it sounds fabulous. I had my 812 hooked to a Lyr and a borrowed Asgard 2, but Lehmann Linear SE I'm using now definently improved the sound. As with all things audio, there is always the law of diminishing returns. Best approach is to set your budget and compare products that suit your tastes. Stick to the budget guideline and resist chasing the last ounce of improvement. Most of these improvements are incremental.
was there much of a difference between the schiit and the lehmann sound wise? do you think you could pick it in a blind test?