Hey DaveyF, who knew a fun and light hearted comparison would turn into an inquisition...lol..
So very true, Andre
Here's my synopsis of what I heard with your LS50's in my system: IMO, the speakers are very clean and fairly extended from probably 70Hz and up. I noticed a little "dryness" overall and a little depth restriction. I was pleased to say that I did not hear the cabinets contribute to the sound or any "ringing" of the tweeter. Dynamic nuance was well taken care of and I did not get the feeling that the speaker was omitting much if anything in the range that it is comfortable performing in. If I were to use an analogy in the automotive world, I would say the little Kef's are very much like a friend's new Fiat Abarth 500. They have a certain get up and go and can make some nice sounds.
For the money, they are hard to beat. If the little KEF 's were at my max budget, I would place them as number one on my list....OTOH, IF my budget could stretch up to $5K or above, then as you correctly stated( IMHO) there are now numerous alternatives.