The Prime does everything better (more timbres, wider open, more relaxed). It is just what you get used to. It has the same feeling of changing your car (premium brand) with 2,5l (Unity) engine to a higher model with 4,5l (Prime) engine. Once you go back you notice the limitations of the 2,5l but after a while you get used to it again and everything is fine as well. The Origo has 3l.
Important is that they are all very well balanced.