Do the lenses that you think you want exist in each system? If yes, it probably doesn't matter too much, modulo changing your mind in the future. An ancillary meta-question: is one of the lenses you want in either system a 'dud'?- If I only plan on buying 2-3 nice lens, maybe one prime and one zoom, will the A6000 be better since I won't need the huge variety seen in M43 system? From what I have figured out it doesn't seem there is a HUGE difference in price and quality between Sony's affordable good lens vs. M43s. (NOT talking about Zeiss lens)
Really won't matter. M43 sensors match current generation APS-C sensors for low light performance in pretty much every test. You could theoretically pixel bin with the higher resolution sensor (reduce the resolution in post processing to reduce high ISO noise), but you'd still be left with high ISO dynamic range, which is really the worse problem. Still, this is a golden age in photography, when even a sloppy photographer like myself can handhold a 1/6s exposure while drunk and come away with a sharp image, all thanks to image stabilization.- Which would work better in low light situations? (I assume outside of low light conditions it would be hard to tell the IQ between the two cameras on any lens on a computer screen)
I think you can use FE-mount lenses on current APS-C cameras. I personally always worry about Sony ADD, but I don't think they're going to flake out this time. You'll probably see more FE-mount than E-mount lenses in the near term because they're needed to support the A7/A7r.- From what I hear Sony is now focusing on the Full-frame lens, should I be worried at all about the future of the APS-C E mount lens or in terms of "future proofing" by buying into APS-C cameras of Sony?
Pick one and take the plunge. I'm a happy M43s user, so I think you should get the Olympus, but I see lots of happy Sony customers running around too. I don't think you'll regret either camera. If you order from B&H, their return policy is quite reasonable.- Any other advice between the two cameras.