My experience is that the soundstage and presentation differ rather dramatically between the KEF Blades and the Magicos. The Magicos present a large but shallow image that is in front of you and is less immersive. The Blades (like Other composite speakers; Vivid, Wilson Benesch, etc…) delivers a more immersive experience with a deeper soundstage.
other things to note, I have a friend who had S5 MK2s and had move to M series. Magico likes power. The more power you can give them, the better they sound. KEF doesn’t require tons of power. Alternatively, this came up in another thread, there are some practical limitations in terms of output via that UniQ driver. If you like to turn it up to 11, the Blades may not be the perfect choice. This is not an issue at normal to reference levels, only beyond reference levels.