I used my 9500ix for the first time today. All I can say is, WOW! I got the longest two detections I have ever gotten around here. They were both K band. The first was 1.9 miles, the second was 1 mile.
I know that doesn't sound long, but in my area I have never had a detection more than .8 miles, no matter what I used (V1.8, STi, S7 X50).
I then went to a known K band false area, and it did better than any detector I have ever owned.
I don't know yet about Ka band, but this thing is literally scorching hot on K band!