Yyz’s comment about the Reference 5 sounding different matches the measurements I have seen. Stereophile has in room measurements of both laid on top of each other and the reference 5 had a lot more in room high frequency roll off.
I feel the Referance 3 on up to include the blades have the same house sound. The blades image and stage better but the Reference line is still good. As a whole both speakers lacked that last bit of detail to my ear.