Alan great kingfisher!
Mind saying what lens you used and whether you cropped at all.
My experience with the 7d is that any images above 320 iso or so just do not allow any cropping, unlike 5diii raws, which allow cropping to about 100 % without any need for noise reduction. For me it is usually better to use the 5diii and crop vs getting the extra reach from the 7d. I think there may be variability in the sensors in the 7 d