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Hi Paul,
Did you try both of the lenses you listed? I suspect the full frame EF lens might be better, but you never know. Did you try stopping down the lenses to reduce coma or did you use them wide open? Stopping down one or two stops should make a considerable difference (improvement) in coma, sharpness and most other aberrations.
Otherwise a Sigma Art 35mm f1.4 or 50mm f1.4 are very sharp and have low coma. The 40mm even lower, but it's heavy and expensive and you need to find a way to operate the aperture with these lenses when not used on a DSLR.
Best
JA
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