I have decision problem is there sense to buy the narrower telephoto lens or not. The price for new would be a high one, ~550€ ($744) and used one would be in eBay for 100€ less. I don't like to buy second hand lenses. Dust inside and warranty gets difficulty if something is wrong. I use to have a 4/3 70-300 and I loved the 1:2 close up ratio at 300mm end giving a 1:1 possibility. That would be missing from this m4/3 variant. I hated the 4/3 model hunting and focus speed but... This new model has greatly improves AF speed. And the tube doesn't rotate or move what is very nice. I miss the AF/MF switch as it was so easy to disable focusing without binding MF to button or using rear-focusing button. I love the 40-150mm R model, I get very sharp shots with it, and I don't care what DXO claims for its 5MPix sharpness to be. It is sharp and more I get problems with air between me and subject than lens sharpness. I would not even consider the incoming Olympus 40-150mm f/2.8 Pro because this cheap model is so great and I don't yet photograph in low light and moving subjects would anyways be blurred. I have made test shots for angle of view with old 4/3 camera and 70-300mm model but it is so so that sharpness with EM-1 is better even when taking with only 40-150mm and cropping. I have so hard time to rationalize the price for the m4/3 lens. And giving only a 2x narrower angle of view feels so minimal. So I ask help from those who own both that which one they use more and do they really need the 150-300 range, and from those two who consider or had considered the 75-300mm and owns 40-150mm m4/3 lens. Of course it is about shooting style but leaving wild life and portraits a side, focusing more to landscape, details and nature, that does many feel they like 75-300mm more than 40-150 and wise versa? There are so few reviews of the 75-300mm m4/3 and it is hard to compare from my own tests as they were with different bodies or in store with same camera.