Well in the planar world the Ananda is kind of like the planar version of an HD800s in that they both lean a bit bright and have good soundstaging and imaging. However, headphones in the high end planar world seem in general darker than in the high end dynamic world.
I briefly heard both HD800s and Ananda at the same time (though I'm going off of memory now) and thought HD800s had more obviously wide soundstage but bass on Ananda seemed to have more quantity. Overall you would probably find Ananda richer sounding even though it is on the leaner side for a planar. For truly opposite type of sound signature to HD800s (i.e. dark sound signature, weightier dynamics, focused soundstage, richer bass) you might lean in the direction of a high end Audeze.
By the way has anyone compared LCD2 Classic to Ananda? Was wondering whether the LCD2 Classic beats out the Ananda on bass quantity and impact...?