I haven't compared them back-to-back but I find their tonality and response rather similar (O/93 and SHL5+). Based on your recent O/96 assessment, I doubt you'd like the Harbeth sound better. With exception of the P3ESRs, the Harbeths I've heard sound similar to your description of the DeVores: *almost like a Focal with a hint of old-school warmth, only less dynamic than DeVore.
If you seek a little more warmth, the Sonus Fabers are indeed a good choice, as are some of the Spendor models.
If you seek a little more warmth, the Sonus Fabers are indeed a good choice, as are some of the Spendor models.