I have the 20's and 846's. The 846's have a bit more detail, are more direct, and more spatially precise. The 20's are more open and spacious. Owning the 20's does not make me want to sell my 846's, and owning the 846's does not make me want to return my 20's. They are different, and both enjoyable. If I want to hear every bit of detail, between the two it would definitely be the 846's. If I want to relax and feel like I am not really missing much, the 20's would get the nod.
I use them both with my Iphone 6s, Onkyo DPX1, and various other devices. I don't have a cipher cable. I did try to buy one after the fact, and Audeze quoted me $100. I just hate to pay double what it would have cost me to have it included... so I won't buy it. I guess I should have just sent them back and reordered.