thanks for this comparison Phil - what I gathered from various threads but your comments should be of value for lots of people wondering about the two speakers.
I ended up taking advantage of good Zu pricing to order a pair of Soul Supremes which I think will work nice in my smallish room.
My current speakers are Harbeth 30.1s so based upon my 10 years ago Druid experience is going to be very different presentation. Have a big Hegel 390 amp - so for first while will have to mate with the Supremes as well although I have also read some prefer big power with their Zu's.
Look forward to reading more about Soul 6 as more comments (and reviews) come in.