IMO I found the G6 amp adequate, but not ideal. After comparing it to the Asgard 3, I discovered that the bass response is somehow nerfed, and that dynamics at lower levels could use a little work. I just patched up to the new firmware, so I can do some retesting.
EDIT: After testing the G6 amp again, the output from the amp is doing a heck of a lot better, and it's a lot harder to hear a difference. And the amp drives the headphones louder. So I can say the G6 with 1.16 firmware is quite acceptable.
Heck, I think my Asgard 3 is kinda redundant..
EDIT2: After more listening, I find the Asgard 3 still better, especially with impact, and a slightly harder hitting and fuller bass. Tho the differences is now a subtle thing, rather than obvious.