Just to be clear, this is the video that most piqued my interest in the 1528's. Yes, I understand that you, in general, can't go by YT videos and, yes, this is a subjective comparison with no measurements. But the recording quality seems decent and it seems pretty level-matched to me.
When I first listened to the comparison of the two speakers over my audio system, I could not tell any difference between the KEF's and the 1528's. However, upon listening via my ear buds, the difference between the two was quite apparent, with the 1528's being much more to my liking, especially for a 50/50 mix of music/movies. Make of it what you want.