Why the hell is this about equivalence? So far as I do know if you have a Fuji camera you can't put a Sony FE 28mm f2 on it anyway. Do you think you're intending to provide all your Fuji gear because the optically inferior FE lens is less expensive? https://cashqyels.theisblog.com/27165804/how-much-you-need-to-expect-you-ll-pay-for-a-good-fuji188