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When looking at lenses that are of similar focal lengths, lens class and release period (no sense in comparing a lens from 2012 to one from 2019) between APS-C and FF there appears to be about a 10% difference in price. I don't know the technical differences between mounts and how easy it would be to change. With Sony there is the additional question of how many people are going to look at a 70-200GM or 400GM with a 10% price difference and say I'll just get the FF because I might switch is a couple years.