Putting off the Ref 1 just because the Uber "unlocks the full potential" is nonsense. There could be a $1300 cable for the 846 that "unlocks the full potential" (re. $1100 silver/gold/cable that one store owner has).
That Roxanne graph seems a little off, that much of a valley and spike at the upper mids and treble is unusual. There's a better one posted in the Roxanne thread. The 846 graph agrees with my ears though.