I'm torn between these three primes or just buying a 12-40 pro. I have long covered. Anyone tried both combinations, made the switch, or done something similar? The 12-40 seems like a bit of a beast, even though I haven't mounted one on my E-M10. It's not as fast, and I love the IQ of these little primes, except the 14 which isn't that great. Any advice here?