I no longer have the LCD-2 and I have a Q701 not a K701. The Q701 headstage "seems" a bit wider but certainly more cohesive. I listen to a lot of classical orchestral stuff (and also go hear it "live") and I think this is a better test than pop music for this headstage bidnuss. There should be no gaps.
I have the K701 and the LCD-2, I would estimate the width of the soundstage of the LCD-2 at 3/4 that of the K701, musicians (jazz or classical chamber music) appear to be much more focused with the LCD-2, they are somewhat diffuse on the K701, one could say there's a gap between the musicians. With orchestral music, I hear a continuous sound field with no gaps though.