Anyone move up from Innuos Zen Mini to Zenith ?

Title pretty much says it all:  wondering if anyone out there has upgraded from the Zen Mini Mk3 to a Zenith Mk3? (skipping over the Zen Mk3).

I've been very pleased with the Mini, but reviews, and Innuos' website, all claim a new level of SQ will be reached going to the Zenith.  If the improvement is only marginal, I suppose I could spend that $ on better 300B tubes, and other improvements.  If significant, I may make that move.

Thank you in advance for any experience you may have with these servers.

Regards to all, Jim