Rom, I detected the slight 'sheen' when auditioning the Ref 2Mk. 2 next to a Boulder 1012 preamp, which seemed at the time to have a slightly warmer more musical sound, still maintaining top/bottom extension. The preamps were driving a Rowland 3.02, and a pair of Utopia (perhaps Altos). By comparison the Ref 2 Mk. 2 sounded just slightly hard. In complete honesty though, I auditioned the Ref 2 Mk. 2 another time on a different system, driving ARC VT200 and Maggie 3.6 speakers, and found it marvellous.
In both cases, the Ref 2 was driven by an ARC CD-3 Mk. 3.