Perhaps the best streaming I have experienced. Still not up to my SSD and that's a deal breaker.
So I have downloaded the Amazon Music fke the .99 a month for 4 months. I cant find any mention of HD within the app nor can I see what the songs actually are. Am I playing lossless already? Frustrating. I am using android, anyone have some tips? 
Make sure you sign up for HD service and not the regular one.

Their mobile app is not that great in showing track information, you are correct it doesn’t say if it’s “HD” or “Ultra HD”. I mostly use my Bluesound Node 2i and so far everything I have played is CD quality or 16 bit 44.1k, I have not seen anything better than that yet.
Amazon is no longer a option fo me and many others due to their recent behavior/