Whats the difference £300 /£700 /£2400 Speakers ..Elac debut 6.2, KEF LS50 and Rogers LS35a

Here is detailed sound review of Elac debut 6.2
Kef LS50 and Rogers ls35a
Using Naim Nap 100 power amp, Linn Wakonda pre amp and Arcam alpha CD player.