EF-6 runs very far into class A - it is amlost too hot to touch even with the baffled chassis heatsinks, I don't think there is much more chance of it dropping out of class-A than any monster speaker amp. Mjolnir apparently runs around 1 Watt into 50 Ohms in class-A. I'm not sure how much biasing current AudioGD use in the Master5/6/8 but it is probably around that ballpark as well from what I hear.
To be honest though I don't think biasing current is a good way to evaluate the performance of amplifiers - for one thing Mjolnir and Master 5/6/8 are both balanced, probably use different transistors with different linearity curves etc. Class A bias has only theoretical advantages with all things being equal.