I suspect your ears are just fine

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Kemper IMO has made a gamble. They created an MK2 that is just a paint job (it uses the same DSP that is common across all Kempers, and a drop-in compatible upgraded applications processor {the one that runs the GUI} to make boot times better ... the same one that is in the Player btw). Their idea was simple. Create something that is identical (and uses the same code base) as MK1, and create an artificial reason that current MK1 users would upgrade (new profiling).
I believe that the main board in MK1 is literally identical to MK2. All A/D, D/A, features, processing, etc are all identical. This is why the MK2 Rack did not inherit built in WiFi from the MK1 Stage. Think about it. They already have this feature in the Stage AND Player (all models that came after the toaster and rack versions) for MK1. How does it make ANY sense that an MK2 Rack and MK2 Toaster WOULDN'T have this feature? It only makes sense if they didn't turn the main board for those products AT ALL and are still making the same main board for both.
On the Kemper forum there was one guy that swears up and down that he can hear the difference between his MK1 and MK2. If this is true, my guess is that it is because of part tolerances being different between the two units. Just like no 2 tube amps would sound "identical" even if they were the same model .... especially if one was new and the other had years of gigging on it.
I think that the company got lazy and arrogant (really arrogant IMO). First with the whole paid upgrade crap, and then they really jumped the shark with the fake MK2 release.
I changed this MORE in the beginning. I still tend to touch definition and clarity a little; however, much more subtle now. When I listen to my guitar in-the-mix (we multi-track all our gigs and practices), lots of times sounds that I have raised the definition and clarity up too much on sound abrasive.