Interesting and relevant to my dilemma. I currently have a pair of the original version 1 LS50 Wireless paired with a couple of B&W ASW608 subwoofers that I got a good deal on and were intended to be placeholders until I could identify something better. Aesthetics is important to me so compact and white are two key criteria. Along came the 2nd generation LS50W and the KC62 subwoofer and I was all set to upgrade to a pair of LS50W mk2 plus twin KC62 (once KEF have resolved an apparent issue with the KC62) but now I'm wondering how the absolute audio quality will compare between the latest generation LS50W plus twin KC62 vs the LS60. Once the official LS50 mk2 stands are included the price of LS50W (~£2,200) + stands (~£400)+ twin KC62 (2 x ~£1,300) is about £5,200 so not a huge difference vs the LS60s. I guess that with twin KC62 giving 1000W amplification in each sub the bass is probably going to go deeper but the integration between all the drivers will be as optimal as KEF can get it with the LS60 vs being left to the user to integrate the LS50W and subs which not everyone will be able to do a good job of. And then there is the driver positioning on the LS60 to give the single coherent source plus the effects you mention all contributing to better imaging.
The LS60 would also avoid that KC62 issue I alluded to which I've read a lot about in the KEF section of the Roon forums. The issue apparently is that the KC62 needs a fairly high input level before it switches on so for quiet music listening, or TV that doesn't have explosions and stuff, the KC62 often won't come out of standby. I can certainly believe that because my B&W subs do similar but at least on the B&W there is a switch to bypass the auto-standby and have them permanently on. There are rumours in the Roon forum that KEF have said they will address this issue, possibly by having the LS50s send a higher out of band frequency to the sub to keep it switched on when the LS50W are active, but this issue has stopped me from replacing my B&W subs with KC62s until now. Perhaps just as well given that I now also have the LS60 as an option.
One thing that worries me a bit about the LS60 though is the side-firing drivers. How much clearance do people think the LS60 needs at either side in order for reflections off walls and/or furniture to not be a problem? My LS50Ws are either side of my chimney breast and I would prefer to keep them closer to the back wall rather than pulling them right into the room as seen in the first picture here for instance -
https://www.stuff.tv/hot-stuff/kefs...e-a-slick-way-to-celebrate-its-60th-birthday/ . I would prefer to have my speakers either side of the chimney breast as opposed to in front of it so I would end up with about 25cm clearance between the side drivers and the chimney breast. I wonder whether that might have a horrible effect on the acoustics.