I own the JBL 4367 and use subs high-passed at 60hz but feel they are pretty good without the subs. I already owned the subs.
Anyway I have demoed the current LaScala and Cornwall IV several times. I feel like the JBL is a better speaker. It is smoother in frequency response (downward sloping treble in room). I feel like the LaSala has a lot more box/horn coloration than the JBL 4367. I found the Cornwall harsher sounding in the mids and highs than the 4367, with the 4367 just being more refined in all aspects. the bass on the 4367 is better than both Klispchs to my ear. It is very detailed and has good leading edge impact. The Cornwall is not bad in the bass, just that the 4367 is better. The LaScala is in bad need of subs, I could not enjoy them long term without subs.
The only real flaw of the 4367 is the somewhat narrow soundstage but I kind of feel that is all horns. Honestly and all and all amazing speaker I have zero plans to sell.
there is a used pair of Volti Vittora on audio mark right now for $11,000 that look nice. I have never heard them but it looks like a higher quality build than the LaScala.