In terms of optics, the DX crop size and FX give you the best bang for your buck, because not only to you get better image quality than the smaller sensors, but there is no real advantage in terms of weight, size and the cost of the lenses themselves. The Olympus 7-14mm f4 is $200 less than the 16-35mm, but it should be considering that it covers a smaller image circle, with a slightly inferior build quality, and it is an older optical design with no vibration reduction.
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