I have read no updates yet with airplay 2 on the yammy's. they're usually late with updating technologies i.e. their DAC is still burr-brown. no offense with Yamaha on this regard. I would also think you may recycle your wharfe 9's with the rx-v585 if you so decide to go this route.
as for Denon, DAC now is AKM since 2017 models and it has phono MM for 2018 models, airplay 2, 6 HDMI inputs, among others. if you could source a lowered-priced for x1400H, I think they will roll-out a airplay2 update with their 2017 AVRs as well.
good luck with your choice & purchase, sir!