Ummm...."whilst a 4/3 sensor would have been OK I was never happy with the IQ compromsies with those" - can you explain what you mean? I cannot see how IQ is related to sensor size. The pixel size and well depth and dark current impact it amongst other things. So you need to match to your chip to you optic to get a good image scale but I cannot see any intrinsic reason why APS-C is better. In fact the larger sensor may give you more issues with vignetting, field flatness etc.
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