The Super 7 made the HD800s and LCD2s sound more alike. They converged toward each other - with the HD800 converging more in the direction of the LCD2 than the other way around - being softer in the treble (and lacking some air) with incredible bass slam. However, I didn't think the Super 7 (with its tube complement at the meet) provided the LCD2 with the most controlled, defined, tightest, and fastest bass compared to a few other amps I've heard or owned.
I'm exactly not sure what you mean by "fluid organic sound" because the HD800s can be plenty that with the right DAC and amp. But if you already prefer certain qualities (delicateness, lack of grain, clarity, etc.) of the LCD-2 that you do not feel exists on the HD800, then you are probably better off sticking with the LCD-2.