@edwinf -
"Would you say it is superior to the Arcam?"
Depends what you are looking for--I had an Arcam amp and remember it leaning towards a darker British sound--warm, very musical and "polite." It worked great with a pair of Dahlquist reissues that had an alloy tweeter and prominent bass via 3 mid/bass cones because it tames/balanced the aggressive sound of the speakers.
I'd say the Denon sound is going to be "larger." YMMV-think of Arcam as listening to music from Row G and Denon as listening to music from Row C.
I see you have Focal Arias-great speakers! How do you describe their sound with the Arcam?