Eh Pat, beginners' luck, I guess
This one was shot at ISO 6400, with the 24-105 L IS @ 24mm 1/4" f/11 no sharpening, no in-camera noise reduction, straight noise reduction on Canon's Digital Photo Pro (no particular settings used):
The one below was taken with the same lens. ISO 25600 (Serious banding but if not very large still usable), 1/40" f/11 noise reduction as above (no in camera noise reduction):
And this one is the same as above but with Noise Ninja applied afterward, most banding is gone. No sharpening done.