Innuos Digital Players - Innuos Zenith MK2 vs Zenith MK3 or ZEN MK3

Used Zenith MK2's and new ZEN MK3's are around the same price point. I am assuming that the Zenith models may be the sweet spot in the Innuos line. A new Zenith MK3 is above my price range but I do wonder how much of a sound quality improvement there is between the Zenith MK2 and Zenith MK3. Recently I got a Lampizator Amber 3 DAC with the newest USB interface which has built in superclocks. I was shopping used Lampizator's in the higher models when someone suggested that, with the ongoing technical upgrades the new Amber 3 may actually sound better than older higher end models. With that dynamic in mind, I wonder if the same could be true of the ZEN MK3 vs the Zenith MK2?