...why do you use m4/3s, when there are other options that fulfil that criteria much better and provide very good image quality as well? I'm posing this question because of numerous posts from many that suggest that the entire raison d'être for m4/3 is small and light cameras and lenses, and that lenses like the 12-40mm and, heaven forbid, 4/3 lenses are considered far too large and heavy for general use. I find this a kind of one dimensional view and perplexing indeed. I've pointed out a couple of times that I use 4/3 lenses because I have a bag full of the most outstanding zoom lenses possibly ever made and the only option today to marry those lenses with a great camera is to use a m4/3s body. I don't find my 4/3 lenses large, heavy or cumbersome whatsoever, in the same vein as I didn't find them large, cumbersome or heavy with my E-3/E-5. Similarly, there are many that don't see the likes of the 12-40mm large, cumbersome and heavy whatsoever. If Olympus just produced tiny, lightweight, lenses and nothing in the pro range of zooms and the like, I bet there would be a hew and cry over the lack of such lenses. Yet in nearly every thread raised on this forum, I see this recurring meme of nothing but tiny, lightweight, lenses will do and the likes of the 12-40mm et al seem to be denigrated because you can't fit them into a snuff box. Personally, I find the absolute beauty of the m4/3 system being the fact that you can have such a wide range of choice to build the sort of system that suits your needs, with a vast array of lenses both old and new to choose from. I think people sometimes lose sight of exactly how flexible and accommodating the m4/3 system really is and fail to realise that many who use the m4/3 system are just as flexible and accommodating of the plethora of options available to suit their needs. Some want small and light, others don't care, as they seek to fulfil other needs, but the constant emphasis on small and light makes it sound as if people don't want that flexibility to be available. That's what makes me wonder why some don't choose a smaller system, if small and light is the absolute priority.