Martykl,
My guess is the MBLs are imaging champions for many because they are more omnidirectional on the top end than the Ohms.
The Ohms use a single soft dome tweeter these days in the series 3 versions as I understand it from John Strohbeen. These are normally mounted to face inwards 45 degrees. The soft dome design provides good dispersion as tweeters go, but it is not omnidirectional.
With the Ohms, when listening on-axis your ears receive sound directly from the tweets, the timbre is brighter and the imaging tends to sound more "etched" like more conventional box designs. When not, the timbre is less bright and the imaging sounds less etched, but the imaging still holds up in terms of being able to localize instruments, recording lines, etc.