The Harbeth has a more romantic sound, is warmer, and sounds fuller (like real music does in front of the orchestra). The Thiel is more a design from the head.
Thanks for your comparison. If I can pursue this: If Thiel is, as is their reputation, a more accurate speaker, and reproducing the music as it was recorded, wouldn't this speaker reproduce music as "real music"? If Harbeth is adding warmth, then isn't this producing an element to the recording that might not have been there in the first place? And, what if the original recording did not have warmth? The Thiel speaker would reproduce that recording without warmth, while the Harbeth, presumably, would add warmth.