Which QA and KEF models did you listen to? Have posted your impressions some where on the forum?
I heard QA 2010. They were extremely exciting with lots of details. And I loved their wide soundstage. It made me feel happy when I heard them. Since they are small, don't expect heavy bass from them.
Against this , KEF Q300. They sounded very flat to me. Don't know, if they were totally new or not burned in, it lacked punch and sounded not that interesting to me. And ofcourse way expensive than Q's.
For both listening denon x1000 was used.