link to image (1.2mb 2700 dpi scan of 35mm film)
It was shot at about F8 so the depth of field should be large enough to cover both the circled regions.
I notice the same issues when enlarging colour negatives in the darkroom, too. I know it's not film flatness in the enlarger because I get the same results at even F22. And if I tell the scanner to focus on the unsharp region it doesn't improve it.
It's a Zeiss 35mm T* Distagon 2.0 ZE and I get corner to corner, near pixel perfect sharpness on my Canon 5D. I'm starting to think it's a serious film flatness issue in my Elan 7e. I'm about to give up on 35mm but it's a shame because the lense is a dream and I have a colour darkroom/workflow now, too. Is there a better made body than this that should help with these flatness issues? Or should I just save the money and not bother with 135 roll film?