M.Zuiko 100-400 f/5.0-6.3 Mark II: The Professional’s Verdict by Thomas Eisl

Thomas Eisl tested the new lens and concluded:

The OM System 100–400mm II is an impressively versatile super telephoto zoom lens that delivers professional results in a compact Micro Four Thirds package. Ideal for wildlife, sports, and macro, it combines excellent optical quality, stabilization, and autofocus in a weather-sealed body.

Pros:
✔️ Sharp across the zoom range
✔️ Excellent image stabilization (up to 7EV with Sync IS)
✔️ Great autofocus performance, up to 25fps
✔️ Compact and weather-sealed design
✔️ Macro-capable and teleconverter-compatible

Cons:
❌ Zoom is not fully parfocal (when zoomed quickly)
❌ Minor vignetting at 400mm
❌ Slight aspherical bokeh artifacts in lab tests

The new lens is at Amazon US&CA&EU, Bhphoto, Adorama, OM Digital.