Hello to you all, I have been searching lately, for information how these two lenses compare to each other when used on the Olympus E-M1 II but I can’t find anything useful yet. This will be a lens for the extra reach, in some occasions. That is also the reason that I want to buy a consumerlens instead of an expensive pro like the 100-400mm. My walkaround lens is the Olympus 12-100mm or the 17 mm for streetphotography. Do I, as an Olympus user, better opt for an Olympus 75-300 II or is the newer weather sealed Panasonic 100-300mm II ,the better choice, despite of not being able to use the dual IS on my Olympus E-M1 II. Does it have a newer technologie vs the 75-300 mark II, that I can also profit of on the OM-D E-M1 mark II? The mark II version of the Olympus lens is at least 5 years on the market in the meantime. I know about the cashback on the Olympus, but I want to to go for the best of the two options. If there is no other difference in quality, in your eyes, I will of course decide for the Olympus. Does anyone of you have experience with these lenses used on an Olympus body. I can find enough information about the Panasonic 100-300 Mark I but I am specially interested in the results of the Panasonic Mark II. Which one would you prefer for using on your Olympus OM-D E-M1 Mark II? My other gear: Olympus 17mm 1.8, Olympus 60mm macro and Olympus 12-100mm. Thank you for your help.