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Should I buy this thing? I have an E-M1 and the Olympus 17mm f/1.8 and it's not a bad lens or anything but I really like 28mm equiv much more than 35mm equiv so I'm considering replacing the 17 with the 15 just for that, although I'm not sure if it'll even be much of a noticeable difference since the 15 is still a bit longer than ideal.