I distinctly remember that Diana Krall's piano did not sound as crisp, open and transparent with the 60s. Maybe this has to do with off-axis performance of the 80s in my room. Maybe the off-axis performance of the 80s is better than the 60s but to hear that difference you have to be in a relatively bright room like mine. If you listened to the line-up in an acoustically dead room, then the off-axis performance of the 80s never got realized.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated