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Message: <blockquote data-quote="Vespobuteo" data-source="post: 3336777" data-attributes="member: 120830">The new Olympus 300/4 IS Pro no doubt will be sharper since it's a prime,especially edge sharpness will be better. From what I have seen in test shots it's probably in the same level as Nikons and Canons latest super-expensive primes.MTF:s even for good zooms always look a bit "worse" in theory,but still they can produce sharp and contrasty photos in practice,I think the Leica 100-400 DG Elmarit will be a good balance between priceand performance. Also a bit lighter and more flexible for walk around use than the 300/4 olympus.The only downside is image stabilization on Olympus cams.I guess you have to select either lens OR in-camera stabilization.Both will probably won't work together.With the Olympus lens you get 6-stops IS when combining both lens and in-camera stabilization with the OMD E-M1.Another thing is autofocus-speed, generally it will be faster for larger aperture lenses.So the Olympus will probably have an advantage here.</blockquote>