dcs Delius vs dcs Elgarplus DAC?

I just bought a dcs delius dac fed by a dcs purcell sampler playing music from an iMac being used as a server. Holy schmoly - this combo is a superb, organic, smooth, highly satisfying digital rig. I mean totally non-fatiguing, no digital glare/harshness or grain.

I know the elgar plus dac is supposed to be better. I want to know how much better than the delius dac? I should be satisfied for an eternity with the highly pleasing sonics. I am tempted to just say to heck with it and enjoy the great music. However, I just have to know - is the elgar plus an incremental or a big step up from the delius? If it is a big step up, the sound has to be stunningly good....