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Welcome to the Forum, Bob. In regard to your question I have owned an A7 III for just over a year and have loved this camera. I have an A7 IV on order not because of any failings on the M3, but because of the added features of the M4. You would be happy with either one, there's just more to love with the A7 IV. For may of us, it may boil down to Pocketbook issues.
