Comparing Fish-Eyes : Rokinon 7.5mm vs Zuiko 8mm (FOV and look)

Thanks!

I checked two copies today but didn't buy any of them. The first had some dust particles between its elements and the second suffered from misalignment. These are two 100% crops of images taken with the second copy, I wouldn't consider it a deal breaker if I wouldn't notice it at also when viewed at 50%:

Right side (good):

taken upside-down

Left side:

pretty blurry, notice the lack of detail on the tree

Time to try another dealer...