I have SP3k + Tsuranagi. But I haven't heard the 320Max or Mjolnir to be able to compare. All I can say is that the Tsuranagi provides quite a step up in sound quality. Prior to that, I hadn't quite realized how much of an improvement a good amp can make.
i got myself a tsuranagi as well but haven’t yet heard the combo as i am waiting for the yatono mini IC. i really heard good things about it so far. no doubt it will be a good step up. naturally, as new stuff comes on the market be it new lotoo or 320max, i feel the FOMO. i guess it’s a part of the hobby too. i am quite content with sp3k. people selling their almost new sp3k for slightly newer daps is a bit confusing. unless of course it’s not to their liking…