My last comments on this.
I was very serious about getting new speakers about a year ago. I had some cash saved and was serious about buying floorstanders to complete my system, I also have WAF considerations as this is in a main living space. In researching these XT6F and XT8F speakers the consensus was that they are very dynamic speakers. They favor the dynamics and swing of the music over detail. Very British sounding, dynamics and transients are the focus. They mate very well with tubes as well.
What HiFi reviewd both the 6F and 8F:
Here is their positive bullet points for the 8F
Plenty of good quality bass
Go loud with ease
Subtle and insightful presentation
Excellent build and finish
Aggressive price
The negatives were requiring a big room and system matching (DUH that is the whole trick).
Good Luck
I would like to go for the White!