I already messaged the OP the other day in response to his PM. This was my reply
I have 6 Wizards at the moment. '16 MTL, '19 MTL KT150, '21 MTL mk2 6L, '21 MTL/MC2 Hybrid, '21 W800 KT150 and a '21 MC2 mk2 KT150.
I've also owned a '20 MTL mk2 el34, '15 MC2, '18 MC2 KT150 and a '20 W800 el34
So I've had a bunch.
I sold my first mk2 MTL after about a year. I preferred the voicing on the '16 a little more. That amp has more of a scooped nature to the mids giving it a more "metal" sound when the amps were set the same. The mk2 was still a killer amp, it was just more forward in the low mids. My KT150 MTL is more like that. The mk2 adds the mid-sweep which is useful in giving it a little more grind in the mids. You can get there with the presence/treble/bright knobs as well. It's really just more tone shaping ability. In the end, I found I really didn't mess with the sweep...kind of a set and forget...so I was happy with my other mk1 MTLs. A guy asked if I was willing to sell my mk2... while I didn't have plans to sell, it wasn't a hard decision.
Rick makes minor tweaks from year to year, but they all have the same basic flavor. I think you'd be happy with either, but you'd save some $ going for an older mk1.
I personally find that I like the KT88 model Wizards the best compared to the el34/6L6 versions.
I will say that my new KT150 MC2 mk2 is night and day better than the old '18 mk1 MC2 KT150 I had.