DXOMark test

https://www.dxomark.com/Reviews/Olympus-M.Zuiko-Digital-ED-25mm-f-1.2-PRO-lens-review-Solid-choice

Small discount, as it goes for $1149 now

https://www.amazon.com/Olympus-M-Zuiko-Digital-25mm-Black/dp/B01LW4IFUI/

Review

https://www.focus-numerique.com/focale-fixe/tests/olympus-m-zuiko-digital-ed-25-mm-f-1-2-pro-3021.html

Comparison with Panasonic 25mm

http://songmatin.blogspot.com/2016/12/lensolympus-25mm-f12-pro-vs-panasonic.html

Portraits usage

http://dc.watch.impress.co.jp/docs/review/lens_review_2/1035806.html

Yes, the lens is expensive. It's really, really good, though. We wanted something to pair with the Leica 42.5, and this fits the bill perfectly. Every bit the same quality. Autofocus is excellent for photography, not great for video, but no worse than the 42.5. I can leave it to the professionals with studios and testing equipment to provide technical comparisons and reviews, but my subjective impression is that this may very well be the top lens in the MFT world now.

I wish it were cheaper, but it's good enough that I'm going to keep it in spite of the price.

This lens is expensive, but does look good.

Review

http://www.imaging-resource.com/lenses/olympus/25mm-f1.2-pro-m.zuiko-digital-ed/review/

http://photoreview.com.au/reviews/lenses/m4-3/olympus-m.zuiko-digital-ed-25mm-f-1.2-pro-lens

At the risk of Vitaliy making fun of me for buying this overpriced lens...

Came in the mail yesterday, but haven't had a chance to get any real impressions yet due to dark, nasty weather. Can say this, though: Autofocus in photo mode (GH4) is one of the fastest and most accurate of any MFT lenses I've used. Autofocus in video mode is... well, pretty worthless. Hunts like crazy, sometimes never finding a subject, even in high contrast scenes. Standing a few meters from my dog, dog centered directly in frame, pressed and held focus button, watched the screen show a varyingly blurry dog for about 30 seconds before I just gave up.

I'll have a better idea of IQ in the next few days once my wife has a chance to have a go with it, then perhaps I'll have a Speedbooster Ultra and Sigma 18-35 for sale...