The mid range horn and drivers on the KI-396 are far superior to the Cornwalls. The weight difference is because the Cornwall cabinet is bigger. You want to pay 3x as much for a pretty wrapper then that's your choice but you're trading in sound quality for a better finish.
I find it funny you think pro speakers have higher distortion than speakers made specifically for the home. Cornwalls will distort and sound like they are struggling way before speakers like KP600'S, Jubilee's, and other pro speakers. The KP600's that someone linked to you to consider buying are the best speakers for rap music I've ever heard and destroy Cornwalls so badly they shouldn't even be compaired.