An update here, Tom.
I've used that MKE 440 now for several concerts in the middle school gym, and it's a decided improvement over the Canon G-20's built-in mics -- I really like it for that, but it still doesn't focus in tightly on the music director announcing (no PA) what's coming up (better than the Canon, though), and it doesn't completely kill the excess echo (a lot of it though), but what triggered this update is that I got a chance to do another concert of my grandson's school, this one in a theater environment (plush seats, carpet, etc.) and it is SUPER. And there was a lot of percussion (drums, steel drums, xylophones, even some choir music and such. I couldn't ask for better sound quality or for better sound distribution across the stereo image.
So the MKE 440 (stereo "super" cardiod) is a sweetheart, and can be used on both my Canon G-20 and my Nikon 7100, giving excellent results on both.