I had both, I kept the Kinetix but I still LOVE the D800+, feature wise I mean how can you beat the D800+?
They offer such a different sound though and the Kinetix was just scratching my itch.
Tube pedals (I have/had a Neptunium, Nobellium, Underground Accelerator, More, Noble) in front of a D800+ will not get you there in terms of what the the Kinetix does.
Interesting!
Can you try to put the difference in sounds they offer into words?