Hi, This awakening to m43 is turning out to be very expensive for me... I've already got my eye on several lens that i WANT (do not necessarily need ) and as an old FF analogue user when you start looking at the lenses... and just the quality of glass and character of the glass. just WOW! So previously I never had an interest in birding/wildlife ... purely because a 300mm+ lens with good optical quality cost me the price of a small second hand car and would need a van to transport! This OMD purchase is opening up lots of creative avenues that I am really hoping to explore... So.. I have two excellent options available to me , but I keep reading conflicting reports on both lens.. The Olympus 75-300 mk ii and the panasonic 100-300. The Panasonic is slightly 'older' but faster , however the Oly is half a stop slower is actually based on an older design again than the Panasonic. Both soften up around the 300mm end as expected and both are super sharp around F5.6 -F8. The Panasonic has OIS but since I have the OMD, thats a moot point because the IBIS would be better than the lens stabilisation anyway? Even with the IBIS of the oly, this is not really a lens I could shoot hand held.... or is it ? (please keep in mind I've only ever used manual focus, analogue film cameras previously with tripods as far as 200mm ........ digital and longer reach than effective 300mm is completely new ). So getting back to it.. from those of you who have used both , and specifically with this camera body I would love to know your opinions. Depending on the lens I've seen sample shots (assuming the same conditions ) where the EM1 shows better DR and sharpnss over the EM5 with the same lens (17mm 1.8). Supposedly a result of a tweaked sensor, no AA filter and more processing (truepic, picture pic 7 or whatever the hell olympus call the CA adjustment etc...). So I am particularly interested in hearing from those who have used both on the EM1 and whether there was any benefit going with the OLY lens given that olympus supposedly ship the EM1 with a bunch of lens profiles in body to optimise sharpness for diffraction and CA etc.... Would i truly see the difference between the two ... no... both lens and camera are far more than I am right now... I'm a total newB to digital. However, given that they are in the same price bracket I like to know that I have spent my money on the lens that will give me the most potential to grow into. Thanks, Tom.