HE-6 vs. LCD-2 rev. 2 soundstage is splitting hairs. Yes, the HE-6 is slightly better, but we aren't talking HD800 or SR-009 (or even just T1) size soundstage here in either case.
Is the LCD-3 better than the LCD-2r2 in this area? Not that I can tell in 3 hours of listening, so even if I find it to be better after further listening, it can't be by much because it doesn't stand out.