Actually I have been using both N-950 (bought for myself) and K-950 (bought for my parents).
I must say, the amount of settings in N-950 is bigger, but .... there is no actual impact on the sound improvement.
My parents have bigger living room (30 sq m vs 20 sq m) and thus the speakers are placed further from each other. This makes the system go and do the job.
So their K-950 performs better than my N-950, but being honest both are doing excellent job.