Well, Coli had wayyy more gain. Was not double plussed, but nonetheless - significantly more gain than the MC. They were similar in that, like you said, they were both tight and punchy with a thunderous low end. More low end on Coli if you wanted it. Both immediate but nothing is as immediate as a wizard, not that that's necessarily a good or bad thing. For a C+, that coli was pretty damn fast on the attack. Coli was more metal and wanted to stay metal, but could be dialed back. Wizard could be dialed in more traditional rock/hard rock more easily if you wanted it. Coli handled lower volumes better funnily enough, but could blow you away really damn fast if you weren't careful. I didn't love the Wizard until the volume got up to band levels personally.
My issue with Mark amps in general is that they don't have as wide of a sonic footprint as a "traditional" amplifier that doesn't rely on a graphic EQ to spread the sound back out. They are always more pokey in a mix and can come across boxy. I personally just want my guitar tones to be room filling and "wall of sound" ish while still having just enough mids ripping your at your face. The Coli was the easily biggest sounding mark in the mix out of the ones I've used in a band setting, but it still had that mark thing going on slightly.