DigitalCameraWorld compared the two latest new OM cameras and concluded:
The OM-5 II is older and technically less advanced than the OM-3, but it’s worth considering whether it still does everything that you need a camera of this type to do? Maybe it does! You still get 20MP images, weather sealing, decent high-speed shooting, one of the best IBIS systems on the market and some clever computational tricks, should you need them.
The OM-3, by contrast, brings a real retro camera feel combined with powerful autofocus, burst shooting and video features that leave the OM-5 II lagging far behind. If you intend shooting a lot of video, then the OM-3 is certainly the better buy. What about action, sports and wildlife photography? Yes, here too, but the OM-1 II would be even better for this kind of work just because of its handling with larger lenses.
For sheer value and practicality, the OM-5 II, even though it’s now somewhat dated, is a great buy. The OM-3 is perhaps more of a luxury buy for those who love its looks, its power and its potential.
OM-5II at BHphoto, Amazon, Adorama, Fotoerhardt, WexUK.
OM-3 at BHphoto, Amazon, Adorama, OM store USA.