I have a CODA dealer 100km from me (so very close). They also said they allow home demos of their gear. I may have a listen once COVID is taken down. The thing that intrigues me on the #16 over the #8 is not the Class A, it is the SNR of 130 vs 118.
The Luxman m900u (12 watt Class A), which I thought was amazing with TAD gear, has similar specs to the #8 (18 watt Class A). The #8 is supposed to sound like the m900u but at 1/3 the cost.
Why not get the Diablo, if you decide that you do not like it you can easily sell it since it is so highly regarded.