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Message: <blockquote data-quote="Tord" data-source="post: 3291695" data-attributes="member: 40738">Having both the E5 and the E-M1, my view is that the E5 is more accurate when it comes to focusing. I recently read about using the E-M1 in portrait orientation in order to improve the PD-AF performance instance when used with 4/3 lenses. I tried this and have to agree that the AF easier acquires focus on relatively small subjects. The ergonomy with the grip is odd yet acceptable, once you learn and remember where the viewfinder is located (bottom left) and the location of the wheels and b-F1/b-F2 buttons. For subjects that fill more of the frame the difference is less clear, but then you would use the landscape orientation anyway to reduce risk of subjects out of frame.I am also inclined to agree that the tracking performance is improved.I think it has to do with the lack of cross-type AF points. Since the AF points detect vertical features only and the silhoutte of a bird against sky has mostly horizontal features, it makes sense to rotate the camera. Below are some samples of a quite challenging subject, flying by at 10m/s or faster. With a few seconds notice, prefocusing at ~25 meters, allowing time enough to point and frame, the AF acquired correct focus in 4 sequences out of 5. The sequence it failed I spotted the Sparrowhawk, emerging from the reeds, too late. EM-1 + 300/2.8 + EC14, 9FPS, 27 AF points, portrait orientationCropped to ~2300 pixels wide.</blockquote>