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Damn, I was expecting a completely different kind of fox!
So what depth were you at? Could be the viz...Ok, not funny. If you want to know what the lens can really do, park the camera on a tripod and shoot a spread out newspaper page after carefully focusing in manual. Check corner sharpness & center at various focal lengths. I suspect you won't be too upset at that point w/ performance but do what you can to be steady as possible whenever squeezing a shot off (above or under water). It would help to know what shutter speed/ focal length etc. you were at for this shot. Also how much cropping was done. Don't sweat it yet. // ww