It is really sharp lens - review

Best fixed focal length lenses are able to reach 80-85 lpmm and the decency level we set near 47-49 lpmm. Of course we clearly indicated that these values could change with the enlargement of our tests database. The last resolution record achieved by the Panasonic Leica DG Elmarit 200 mm f/2.8 POWER O.I.S.,which maximum result exceeded 91 lpmm, makes that decision fully justified. Currently we should say that the decency level is set within 48-50 mm range and the best fixed focal primes should be able to get to a level of about 85 lpmm or higher.

https://www.lenstip.com/524.1-Lens_review-Olympus_M.Zuiko_Digital_ED_45_mm_f_1.2_PRO_Introduction.html

Our Interview about Olympus Pro prime lenses lineup

Our third interview concerning this lens

Review

Olympus's recent Zuiko Pro lenses, both zooms and primes, have all shown stunning results when it comes to sharpness, and the 45mm f/1.2 Pro is no exception. Even wide open, the lens displays excellent sharpness across the entire frame. We measured a slight increase in sharpness if you stop down slightly, down to f/2.8, but overall, increase in sharpness is quite subtle compared to wide open. Although with a lens like this, you're unlikely to shoot it stopped down significantly, but nevertheless the 45mm f/1.2 still offers fantastic sharpness at f/11. We do, finally, see some diffraction-related softness appear by f/16, the lens' narrowest aperture.

https://www.imaging-resource.com/lenses/olympus/45mm-f1.2-pro-m.zuiko-digital-ed/review/

Selling for $999 now

• https://www.adorama.com/iom4512.html
• https://www.amazon.com/dp/B0767NDXY5

Lens design is by Sigma (according to patent)

Most lenses are at their "best" when stopped down about 2 stops so it's not completely unexpected that an f/2 lens stopped down two stops has an edge over an f/1.2 lens stopped down 3 1/2 stops. :)

Not much difference at the top, but it looks like Olympus just edges out all the others in a crowded field.