One of the goals for Spark is to raise the bar of Drupal authoring experience to be comparable to or even beat that of some of our competitors.
Chris Strahl and I gave a presentation on this at DrupalCon Denver (http://denver2012.drupal.org/content/five-things-we-need-create-awesome-...). Unfortunately, the video seems to have been lost. :( However, the slide deck with the links to the videos we showed are in there. Unfortunately that means the SquareSpace Beta demo at the end is lost, and was one of the most impressive. :(
Internally, within Acquia, the general consensus has been that Adobe CQ is the bar we want to reach. There's an intro video at http://www.day.com/day/en/resources/video/webcontentmanagement-overview.... (warning: includes "ENTERPRISE VOICE" :P).
See also http://groups.drupal.org/cms-feature-reviews, a group for cataloguing + discussing this kind of competitive analysis.