lens – Panasonic Lumix G 25mm f / 1.7 ASPH vs Olympus M. Zuiko 25mm f / 1.8

I want to understand what are the benefits of Olympus M. Zuiko 25mm f / 1.8 compared to Panasonic Lumix G 25mm f / 1.7 ASPH because Panasonic is half the price.

Looking at the specifications, these are pretty much the same, except for a few differences.

Can any one give a good opinion on the fact that it is worth buying one rather than another?
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