I got the LCD-R in yesterday (running off jot a only). I heard some people compare it to the susvara, and to me it's pretty different. LCD-R is much more "fun" and engaging. Can be pretty intimate but also has pretty good stage size. Susvara on the other hand is much more laid back and not as in your face. Susvara is easily more natural. This isn't to put the LCD-R down whatsoever (anyways the comparison is a bit incongruent anyhow), but rather to say that they do very different things in my opinion and I gravitate to either based on music and mood. I think I prefer the LCD-R over the LCD-4z, mostly for preferences (LCD-R being a lot more fun and engaging and has very nice bass slam). I haven't owned the lcd24 for sometime and don't have the LCD4 anymore, but if I could compare directly, I think LCD-R may be the one I would keep out LCD-4, LCD-24, LCD-4z and LCD-R.
Overall very nice headphone and absolutely stunning fwiw but between 1266tc/susvara, I will probably be letting the LCD-R go soon as tends to happen seemingly every headphone that is not mysphere or sr1a.